Footnote 453:
_Publ. Pac. Society_, vol. i. p. 81.
Footnote 454:
Hale, _Yerkes Observ. Report_, ii. p. 6.
Footnote 455:
_Potsdam Publ._ No. 14, p. 15.
Footnote 456:
_Astr. and Astroph._ vol. xiii. pp. 460, 468.
Footnote 457:
Campbell, _Astr. and Astroph._ vol. xiii. pp. 456, 468; Pickering, _Astr. Nach._ No. 3025; Vogel, _Potsdam Publ._ No. 14, p. 17; A. J. Cannon, _Harvard Annals_, vol. xxviii. pp. 147, 248.
Footnote 458:
Pickering, _Astr. Nach._ No. 2986.
Footnote 459:
_Astr. and Astroph._ vol. xiii. p. 461.
Footnote 460:
_Ibid._ vols. xii. p. 913; xiii. p. 461.
Footnote 461:
_Astr. Nach._ No. 3471.
Footnote 462:
_Astroph. Journ._ vol. viii. p. 113.
Footnote 463:
_Proc. Royal Society_, vol. xlix. p. 33.
Footnote 464:
Jewell, _Astroph. Journ._ vol. iii. p. 99.
Footnote 465:
_Astr. Nach._ No. 2000.
Footnote 466:
Frost-Scheiner, _Astr. Spectroscopy_, p. 323.
Footnote 467:
Argelander, _Astr. Nach._ No. 624.
Footnote 468:
_Monthly Notices_, vol. li. p. 12; Krüger, _Cat. der färbig. Sterne_, p. 81.
Footnote 469:
_Astr. Nach._ No. 3200.
Footnote 470:
_Ibid._ No. 3633.
Footnote 471:
_Monthly Notices_, vol. li. p. 12.
Footnote 472:
_Cat. der färbig. Sterne_, p. 99.
Footnote 473:
_Bothkamp Beob._ Heft ii. p. 146.
Footnote 474:
Copeland, _Monthly Notices_, vol. xlvii. p. 92.
Footnote 475:
_Astr. Nach._ No. 2539.
Footnote 476:
_Proc. Royal Society_, vol. lvii. p. 174.
Footnote 477:
_Monthly Notices_, vol. lix. p. 505.
Footnote 478:
_Sugli Spettri Prismatici delle Stelle_, Mem. ii. 1868.
Footnote 479:
Frost-Scheiner, _Astr. Spectroscopy_, p. 256.
Footnote 480:
Lockyer, _Proc. Royal Society_, vol. lvii. p. 173.
Footnote 481:
_Publ. Pacific Society_, vol. i. p. 80.
Footnote 482:
_Astr. Nach._ No. 3129.
Footnote 483:
A. C. Maury, _Harvard Annals_, vol. xxviii. pp. 124, 126.
Footnote 484:
_O Gyalla Beob._ Bd. vii. p. 14.
Footnote 485:
_Harvard College Circular_, No. 32; _Annals_, vol. xxviii. p. 183.
Footnote 486:
_Harvard Circular_, No. 32.
Footnote 487:
_Ibid._ No. 21; _Annals_, vol. xxviii. p. 184.
Footnote 488:
_Astroph. Journ._ vol. ii. p. 180.
Footnote 489:
_Fifty-fifth Harvard Report_, p. 10; _Harvard Circular_, No. 60; _Annals_, vol. xxviii. pp. 180, 183.
Footnote 490:
Fleming, _Monthly Notices_, vol. liii. p. 275; _Harvard Circular_, No. 4.
Footnote 491:
_Astroph. Journ._ vol. i. p. 411.
Footnote 492:
_Harvard Circular_, No. 32.
Footnote 493:
Fleming, _Astr. Nach._ No. 3054; _Astr. and Astrophysics_, vol. xi. p. 27.
Footnote 494:
_Astroph. Journ._ vols. x. p. 365; xvi. p. 114.
Footnote 495:
A. C. Maury, _Harvard Annals_, vol. xxviii. p. 104.
Footnote 496:
_Astr. and Astrophysics_, vol. xi. pp. 269, 372, 550.
Footnote 497:
_Atti dell’ Accad. degli Agiati_, t. ii. 1896.
Footnote 498:
_Astr. Nach._ No. 1099.
Footnote 499:
Krüger, _Cat. der färbig. Sterne_, p. 9.
Footnote 500:
Known as “64 _b_ Schjellerup” = Krüger 513. See _Cat. der färbig. Sterne_, p. 33.
Footnote 501:
No. 6803 of the _Copenhagen Catalogue_ = 214 Schjellerup = Krüger 1436.
Footnote 502:
Krüger 504.
Footnote 503:
Binary in slow motion (Innes). Composite spectrum (A. J. Cannon).
Footnote 504:
S.D.M. −10° 513 and S.D.M. −10° 5057 of eighth and seventh magnitudes respectively.
Footnote 505:
_Mensuræ Micrometricæ_, p. lxxxi.
Footnote 506:
_Intellectual Observer_, vol. ii. p. 138, 1863.
Footnote 507:
_Annales de l’Observatoire de Nice_, t. ii.
Footnote 508:
Webb, _Celestial Objects_, 4th ed., p. 297; _Knowledge_, vol. xiii. p. 250.
Footnote 509:
_Astr. Nach._ No. 3023.
Footnote 510:
_Journ. Brit. Astr. Ass._ vol. v. p. 457.
Footnote 511:
_System of the Stars_, p. 159.
Footnote 512:
_Les Étoiles_, p. 690.
Footnote 513:
Webb, _Cel. Objects_, vol. ii. p. 182.
Footnote 514:
Burnham, _Astr. Nach._ Nos. 2875, 3114.
Footnote 515:
A. C. Maury, _Harvard Annals_, vol. xxviii. pp. 93, 99.
Footnote 516:
_The Observatory_, vol. xxii. p. 387.
Footnote 517:
_Phil. Trans._ vol. cliv. p. 431.
Footnote 518:
_Bothkamp Beob._ Heft ii. p. 28.
Footnote 519:
_Astr. Nach._ No. 3034.
Footnote 520:
_Harvard Annals_, vol. xxviii. p. 93.
Footnote 521:
A. C. Maury, _Harvard Annals_, vol. xxviii. pp. 92, 100.
Footnote 522:
Leavenworth, _Publ. Leander M‘Cormick Observatory_, vol. i. pt. iv. p. 96.
Footnote 523:
A. C. Maury, _Harvard Annals_, vol. xxviii. pp. 17, 119.
Footnote 524:
Pickering, _Astroph. Journ._ vol. vi. p. 350.
Footnote 525:
Huggins, _Atlas of Spectra_, p. 164, plate xii.; Bélopolsky, _Astr. Nach._ No. 3510.
Footnote 526:
_Astroph. Journ._ vol. viii. p. 307.
Footnote 527:
_Nature_, vol. lx. p. 249.
Footnote 528:
Maunder, _Knowledge_, vol. xiv. p. 73.
Footnote 529:
_Astroph. Journ._ vol. vi. p. 326.
Footnote 530:
_Atlas of Spectra_, p. 160.
Footnote 531:
_Monthly Notices_, vol. xxxvii. p. 278. The difficulties in applying the theory were pointed out by Vogel, _Astr. Nach._ No. 2141.
Footnote 532:
Scheiner, _Astr. Nach._ No. 2924; _Potsdam Publ._ Bd. vii. p. 232.
Footnote 533:
_Comptes Rendus_, t. cxxi. p. 629.
Footnote 534:
_Sitzungsberichte_, Berlin, 17th Nov. 1898.
Footnote 535:
_Astr. and Astrophysics_, vol. xii. p. 719.
Footnote 536:
_Phil. Trans._ vol. clxxxiv. p. 696.
Footnote 537:
_Atlas of Spectra_, Plate ix.
Footnote 538:
_Atlas of Spectra_, p. 69.
Footnote 539:
_Comptes Rendus_, t. cxxi. p. 629.
Footnote 540:
The method usually employed is that given by Lehmann-Filhés, _Astr. Nach._ No. 3242.
Footnote 541:
A. C. Maury, _Astroph. Journ._ vol. viii. p. 174.
Footnote 542:
_Harvard Annals_, vol. xxvi. p. xviii.; _Harvard Circular_, No. 11; _Astr. Nach._ No. 3017; _Monthly Notices_, vol. l. p. 297.
Footnote 543:
_Sitzungsberichte_, Berlin, 2nd May 1901; _Astroph. Journ._ vol. xiii. p. 324.
Footnote 544:
_Astr. Nach._ No. 3456.
Footnote 545:
_Comptes Rendus_, t. xiii. p. 438; quoted by Gore, _Knowledge_, vol. xxii. p. 201.
Footnote 546:
_Monthly Notices_, vol. li. p. 316.
Footnote 547:
_Astr. Nach._ No. 3242.
Footnote 548:
_Ibid._ No. 3629.
Footnote 549:
Vogel, _ibid._ No. 3017.
Footnote 550:
_Astroph. Journ._ vol. viii. p. 173.
Footnote 551:
_Harvard Circular_, Nos. 11, 21.
Footnote 552:
_Sitzungsberichte_, Berlin, 24th April 1890; _Astr. Nach._ No. 2995.
Footnote 553:
_Astroph. Journ._ vol. v p. 1.
Footnote 554:
_Memorie degli Spettroscopisti Italiani_, vols. xxvi., xxviii.; _Bulletin de l’Acad. des Sciences_, St. Pétersbourg, t. vi. No. 1, t. viii. No. 2.
Footnote 555:
See _Observatory_, vol. xxiii. p. 127.
Footnote 556:
_Astroph. Journ._ vol. x. p. 177; _Observatory_, vol. xxiii. p. 92.
Footnote 557:
_Ibid._ vols. xxii. p. 436, xxiii. p. 93; _Monthly Notices_, vol. lx. p. 418.
Footnote 558:
_Astr. Journ._ No. 484.
Footnote 559:
_Monthly Notices_, vols. lx. p. 595, lxi. p. 70.
Footnote 560:
_Astroph. Journ._ vol. xiii. p. 89.
Footnote 561:
See Appendix, Table II., for a list of the spectroscopic binaries discovered down to the middle of the year 1902.
Footnote 562:
_Harvard Annals_, vol. xxviii. p. 104.
Footnote 563:
_Observatory_, vol. xxiii. p. 128 (A. M. Clerke).
Footnote 564:
_Proc. Amer. Academy_, vol. xvi. p. 27.
Footnote 565:
_Popular Astronomy_, Oct. 1897, p. 306.
Footnote 566:
_Sitzungsberichte_, Berlin, 28th Nov. 1889; _Astr. Nach._ Nos. 2947, 2960.
Footnote 567:
_Astr. Journ._ vol. vii. p. 165.
Footnote 568:
_Knowledge_, vol. xv. p. 86 (A. M. Clerke).
Footnote 569:
_Astr. Journ._ Nos. 255, 256, 257.
Footnote 570:
Bauschinger, _V. J. S. Astr. Ges._, Jahrgang xxix.; Chase, _Astr. Journ._ No. 218.
Footnote 571:
Boss, _Astr. Journ._ No. 343; Yendell, _Pop. Astr._ Dec. 1897, p. 401.
Footnote 572:
_Comptes Rendus_, t. cxx. p. 125; _Bull. Soc. Astr. de France_, 1895, p. 73.
Footnote 573:
_Astr. Journ._ No. 318.
Footnote 574:
_Astr. Nach._ No. 804.
Footnote 575:
Schönfeld, _V. J. S. Astr. Ges._, Jahrgang ix. p. 230; _Sirius_, Bd. x. p. 68; Argelander, _Bonner Beob._ Bd. vii. p. 397.
Footnote 576:
_Astroph. Journ._ vol. x. p. 317.
Footnote 577:
Schönfeld, _Jahresbericht_, Mannheim, Bd. xl. p. 76.
Footnote 578:
_Beobachtungen Veränderlicher Sterne_, Th. iii. p. 21.
Footnote 579:
_Astr. Nach._ No. 3474.
Footnote 580:
_Journ. Brit. Astr. Assoc._ vol. i. pp. 137, 255.
Footnote 581:
Chandler, _Astr. Journ._ No. 205.
Footnote 582:
_Astr. Journ._ No. 373; _Astroph. Journ._ vol. iv. p. 267.
Footnote 583:
Roberts, _Astroph. Journ._ vol. x. p. 313.
Footnote 584:
_Proc. Amer. Acad._ vol. xvi. p. 350; _Astr. Nach._ No. 3385.
Footnote 585:
_Astr. Journ._ No. 199; _Popular Astr._ Sept. 1897, p. 239.
Footnote 586:
_V. J. S. Astr. Ges._ Jahrgang xxvi. Th. ii.; _Potsdam Annual Report_.
Footnote 587:
Chandler, _Astr. Journ._ Nos. 199, 294, 396.
Footnote 588:
Tisserand, _Bull. de la Soc. Astr. de France_, Mars 1895.
Footnote 589:
_Astr. Journ._ Nos. 162, 294.
Footnote 590:
_System of the Stars_, p. 142.
Footnote 591:
_Astr. Nach._ Nos. 3091, 3467; _Astr. Journ._ No. 265; _Trans. Swedish Acad. of Sciences_, 1892, No. 7.
Footnote 592:
Yendell, _Astr. Journ._ Nos. 163, 185; _Knowledge_, vol. xvi. p. 166 (A. M. Clerke).
Footnote 593:
_Astroph. Journ._ vol. xi. p. 190.
Footnote 594:
_I.e._ the interval between one perihelion passage and the next.
Footnote 595:
Russell, _Astroph. Journ._ vol. x. p. 318.
Footnote 596:
_Astr. Journ._ Nos. 327, 383.
Footnote 597:
_Ibid._ No. 383; _Astroph. Journ._ vol. iv. p. 272.
Footnote 598:
Chandler, “Third Catalogue of Variable Stars,” _Astr. Journ._ No. 379.
Footnote 599:
_Astr. Journ._ No. 326.
Footnote 600:
_Ibid._ Nos. 329, 384, 415.
Footnote 601:
_Monthly Notices_, vol. lv. p. 211.
Footnote 602:
_Astr. Journ._ No. 327; _Astroph. Journ._ vol. iv. p. 270.
Footnote 603:
_Ibid._ vol. x. p. 314.
Footnote 604:
Keeler, _ibid._ vol. i. p. 262.
Footnote 605:
_Astr. Journ._ No. 328.
Footnote 606:
_Astroph. Journ._ vols. i. p. 294; iii. p. 348; _Astr. Journ._ Nos. 374, 384, 422.
Footnote 607:
Yendell, _ibid._ No. 366.
Footnote 608:
_Harvard Circulars_, Nos. 3, 4.
Footnote 609:
_Astroph. Journ._ vol. iii. p. 213.
Footnote 610:
Pickering, _ibid._ vol. vii. p. 23.
Footnote 611:
_Astr. Journ._ Nos. 447, 450; Luizet, _Astr. Nach._ No. 3596.
Footnote 612:
_Astr. Journ._ No. 468.
Footnote 613:
_Astroph. Journ._ vol. xiii. p. 177.
Footnote 614:
_Astr. Nach._ Nos. 3572, 3567; Parkhurst, _Astr. Journ._ No. 475.
Footnote 615:
_Harvard Circulars_, Nos. 44, 47.
Footnote 616:
_Astr. Journ._ No. 508; _Proc. Royal Society of Edinburgh_, 4th Nov. 1901.
Footnote 617:
_Astr. Nach._ Nos. 3748, 3765; _Astr. Journ._ No. 517.
Footnote 618:
Such have recently been detected by Chandler in Algol, _Astr. Journ._ Nos. 509, 511.
Footnote 619:
_Astr. Nach._ Nos. 3257, 3338; _Bull. de l’ Acad. St. Pétersbourg_, 1894, p. 268; _Astroph. Journ._ vol. i. pp. 160, 263.
Footnote 620:
_Astroph. Journ._ vol. ii. p. 288.
Footnote 621:
_Astroph. Journ._ vol. iii. p. 227.
Footnote 622:
_Ibid._ vol. i. p. 160.
Footnote 623:
_Astroph. Journ._ vol. vi. p. 393; _Bull. de l’Acad. de St. Pétersbourg_, t. vii. No. 4, 1900.
Footnote 624:
_Astroph. Journ._ vol. ix. p. 59.
Footnote 625:
Chandler, _Third Catalogue_, No. 8073 and _note_.
Footnote 626:
_Journ. Brit. Astr. Assoc._ vol. vii. p. 471.
Footnote 627:
_Astr. Nach._ No. 3483; Luizet, _ibid._ No. 3570; Flanery, _Knowledge_, vol. xxiii. p. 134; _Harvard Circular_, No. 41.
Footnote 628:
Sometimes designated SU Cygni.
Footnote 629:
Lockyer, _Proc. Royal Society_, vol. lix. p. 101.
Footnote 630:
Its fourth member, Y Sagittarii, was added by Sawyer in 1886, _Astr. Journ._ No. 328; Yendell, _Pop. Astr._ vol. ii. p. 364.
Footnote 631:
Chandler, _Astr. Journ. Nach._ No. 2749; Yendell, _Astr. Journ._ Nos. 157, 321; _Pop. Astr._ vol. ii. p. 207.
Footnote 632:
_Astr. Journ._ No. 374.
Footnote 633:
_Bonner Beob._ Bd. vii. p. 393.
Footnote 634:
_Astr. Nach._ Nos. 1745, 2420.
Footnote 635:
_Ibid._ No. 3565.
Footnote 636:
_Astroph. Journ._ vol. xiii. p. 94.
Footnote 637:
_Astr. Journ._ Nos. 378, 384; _Astroph. Journ._ vol. x. p. 312; _Nature_, vol. lxiv. p. 469.
Footnote 638:
_Astr. Journ._ vols. ix. pp. 180, 183, 190; x. p. 11.
Footnote 639:
_Astroph. Journ._ vol. iv. p. 141.
Footnote 640:
_Astr. Journ._ No. 413.
Footnote 641:
Pickering, _Astr. Nach._ No. 3008.
Footnote 642:
Chandler, _Astr. Journ._ Nos. 358, 374, 426.
Footnote 643:
_Harvard Circular_, Nos. 23, 25.
Footnote 644:
_Astroph. Journ._ vol. viii. p. 163.
Footnote 645:
_Harvard Circular_, No. 33; _Harvard Annals_, vol. xxxviii. pp. 144, 160 (Bailey).
Footnote 646:
Cf. _Observatory_, vol. xx. p. 54.
Footnote 647:
_Astr. Nach._ No. 3410.
Footnote 648:
_Astr. Journ._ No. 477; _Astroph. Journ._ vol. xiii. p. 177; _Nature_, 12th September 1901.
Footnote 649:
_Harvard Circular_, No. 21.
Footnote 650:
Since the above was written, Miss A. J. Cannon has made the brief statement (_Harvard Annals_, vol. xxviii. p. 177) that the 34^h period satisfies all observations.
Footnote 651:
_Astr. Nach._ No. 3483.
Footnote 652:
_Astr. Nach._ No. 3570.
Footnote 653:
_Harvard Circular_, No. 41.
Footnote 654:
_Astr. Journ._ No. 331.
Footnote 655:
S. I. Bailey, _Astroph. Journ._ vol. x. p. 257.
Footnote 656:
S. I. Bailey, _Harvard Annals_, vol. xxxviii. p. 209.
Footnote 657:
_Monthly Notices_, vol. lxi. p. 163.
Footnote 658:
Bailey, _Harvard Annals_, vol. xxxviii. p. 234.
Footnote 659:
See _Knowledge_, vol. xvii. p. 128 (A. M. Clerke).
Footnote 660:
Frost, _Astroph. Journ._ vol. ii. p. 383.
Footnote 661:
_Astr. Nach._ No. 3565.
Footnote 662:
_History of Astronomy_, 4th ed. p. 379 (A. M. Clerke).
Footnote 663:
_Astr. Nach._ No. 3051.
Footnote 664:
_Astr. and Astrophysics_, vol. xiii. p. 575.
Footnote 665:
_Monthly Notices_, vol. lvii. p. 6; _Observatory_, vol. xx. p. 87.
Footnote 666:
_Harvard Annals_, vol. xxviii. p. 103.
Footnote 667:
_Sitzungsberichte_, Berlin, 8th Feb. 1894.
Footnote 668:
_Monthly Notices_, vols. liv. p. 94; lvii. p. 515.
Footnote 669:
_Memorie degli Spettroscopisti Italiani_, t. xxvi., June 1897.
Footnote 670:
_Astroph. Journ._ vol. vii. p. 1.
Footnote 671:
_Astr. and Astrophysics_, vol. xii. p. 356.
Footnote 672:
Baxendell, _Proc. Manchester Phil. Society_, vol. xxiv. p. 14.
Footnote 673:
Flanery, _Knowledge_, vol. xix. p. 230.
Footnote 674:
_Bonner Bcob._ Bd. vii. Th. ii. p. 332.
Footnote 675:
_Phil. Trans._ vol. lxx. p. 342.
Footnote 676:
Schmidt, quoted by Schönfeld, _Mannheimer Jahresbericht_, Bd. xl. p. 74.
Footnote 677:
Nijland, _Astr. Nach._ No. 3733.
Footnote 678:
Guthnick (_Astr. Nach._ No. 3745) holds that the star rises to exceptionally high maxima once in 591⁄2 years. As the Italian proverb says, _Chi vivrà, vedrà_.
Footnote 679:
_Berliner Jahrbuch_, 1841, p. 93 (Olbers).
Footnote 680:
_Miscellanea Berolinensia_, t. i. p. 208.
Footnote 681:
_Bonner Beob._ Bd. vii. p. 340.
Footnote 682:
Humboldt’s _Cosmos_ (Otté’s trans.), vol. iii. p. 236.
Footnote 683:
Roberts, _Astr. Journ._ Nos. 295, 491–2.
Footnote 684:
A. J. Cannon, _Harvard Annals_, vol. xxviii. p. 189.
Footnote 685:
Roberts, _Astr. Journ._ No. 462.
Footnote 686:
_Astroph. Journ._ vol. ii. p. 198.
Footnote 687:
Baxendell, _Journ. Liverpool Astr. Soc._ vol. iii. p. 52.
Footnote 688:
Schönfeld, _Astr. Nach._ No. 2066.
Footnote 689:
Peek, _Journ. Brit. Astr. Assoc._ vol. ix. p. 261.
Footnote 690:
_Astr. Nach._ No. 3025; Hartwig, _ibid._ Nos. 3211, 3596.
Footnote 691:
Hale, _Yerkes Observatory Bulletin_, No. 13.
Footnote 692:
_Journ. Brit. Astr. Assoc._ vol. ix. p. 260.
Footnote 693:
_Astr. Nach._ No. 2859.
Footnote 694:
Peek, _Variable Star Notes_, No. 4.
Footnote 695:
Townley, _Publ. Washburn Observatory_, vol. vi. pt. iii. p. 60.
Footnote 696:
_Astroph. Journ._ vol. i. p. 305.
Footnote 697:
Parkhurst, _Popular Astronomy_, vol. i. p. 462.
Footnote 698:
Schmidt, _Astr. Nach._ No. 1897; Chandler, _Astr. Journ._ Nos. 186, 193.
Footnote 699:
Parkhurst, _Pop. Astr._ vol. i. p. 266.
Footnote 700:
Reed, _Astr. Journ._ No. 330.
Footnote 701:
Peek, _Variable Star Notes_, No. 2, p. 13.
Footnote 702:
Knott, _Observatory_, vol. xiii. p. 111.
Footnote 703:
_Astr. Nach._ No. 3184.
Footnote 704:
_Bulletin de l’Acad. Imp._ t. xxix. p. 302.
Footnote 705:
Peek, _Knowledge_, vol. xv. p. 52.
Footnote 706:
_Yerkes Observatory Bulletin_, No. 13.
Footnote 707:
_Knowledge_, vol. xix. p. 230.
Footnote 708:
_Ibid._ vol. xx. p. 237.
Footnote 709:
_Pop. Astr._ vol. v. p. 164.
Footnote 710:
Yendell, _ibid._ p. 17.
Footnote 711:
_Astr. Journ._ No. 400.
Footnote 712:
Pickering, _Astroph. Journ._ vol. iv. p. 370.
Footnote 713:
Parkhurst, _Pop. Astr._ July 1900, p. 343.
Footnote 714:
_Astroph. Journ._ vol. xii. p. 268.
Footnote 715:
_Vierteljahrsschrift Astr. Ges._ Jahrgang xxxiv. p. 315.
Footnote 716:
_Astr. Nach._ No. 3553.
Footnote 717:
_Astr. Nach._ Nos. 2075, 2420, 2491, 2492.
Footnote 718:
_Astr. Journ._ Nos. 491, 492 (1901).
Footnote 719:
_Astr. Nach._ No. 1905.
Footnote 720:
_Journ. Brit. Astr. Assoc._ vol. v. p. 262.
Footnote 721:
Pickering, _Proc. Amer. Acad._ vol. xii. p. 403.
Footnote 722:
Schönfeld, _Mannheimer Jahresberichte_, Bd. xl. p. 113.
Footnote 723:
_Monthly Notices_, vol. xvii. p. 23.
Footnote 724:
B.D. + 30° 591, now known as X Persei.
Footnote 725:
_Astr. Journ._ Nos. 434, 462; _Astr. Nach._ No. 3577.
Footnote 726:
Safarik, _Journ. Brit. Astr. Assoc._ vol. ii. p. 293.
Footnote 727:
_Astr. Nach._ No. 3011.
Footnote 728:
_Astr. Journ._ No. 231.
Footnote 729:
Peek, _Journ. Brit. Astr. Assoc._ vols. ix. p. 260; x. p. 156.
Footnote 730:
Miss Cannon found indications, in the spectrum of η Carinæ, of a composite origin from a solar, and a bright-line helium star. _Harvard Annals_, vol. xxviii. p. 175. Sir David Gill recorded numerous spectral coincidences between the southern variable and Nova Aurigæ. _Monthly Notices_, vol. lxi. p. 456.
Footnote 731:
_Monthly Notices_, vol. vi. p. 244.
Footnote 732:
_System of the Stars_, p. 116.
Footnote 733:
Roberts, _Astr. Journ._ No. 492, p. 89.
Footnote 734:
_Astr. Nach._ Nos. 624, 796, 806.
Footnote 735:
Gore, _Revised Cat. of Var. Stars_, 1888.
Footnote 736:
_Astr. Journ._ No. 151.
Footnote 737:
H. Corder, _Memoirs Brit. Astr. Assoc._ vol. v. pt. ii. p. 32.
Footnote 738:
_Astr. Nach._ No. 2704.
Footnote 739:
A. C. Maury, _Harvard Annals_, vol. xxviii. p. 31.
Footnote 740:
_Monthly Notices_, vols. l. p. 94; lv. p. 445.
Footnote 741:
_Monthly Notices_, vol. lix. p. 374.
Footnote 742:
_Ibid._ vol. lx. p. 425.
Footnote 743:
_Knowledge_, vol. xvi. p. 124.
Footnote 744:
Gore, _ibid._ vol. xxii. p. 176.
Footnote 745:
_Astr. Nach._ No. 3475.
Footnote 746:
_Astr. Nach._ No. 3118.
Footnote 747:
_Astr. and Astrophysics_, vol. xi. p. 393.
Footnote 748:
_Ibid._ p. 810.
Footnote 749:
_Ibid._ vol. xii. p. 159.
Footnote 750:
_Abhandlungen der Kön. Akad._ Berlin, 1893, p. 58.
Footnote 751:
_Discourse at the Royal Institution_, 13th May 1892.
Footnote 752:
_Astr. and Astrophysics_, vol. xi. p. 607.
Footnote 753:
_Ibid._ p. 907.
Footnote 754:
Campbell, _Astr. and Astrophysics_, vol. xi. p. 715.
Footnote 755:
Huggins, _Proc. Royal Society_, vol. liv. p. 30.
Footnote 756:
_Astr. and Astrophysics_, vol. xii. p. 728.
Footnote 757:
_Astr. and Astrophysics_, vol. xii. p. 54.
Footnote 758:
_Publ. Pacific Society_, vol. iv. p. 246.
Footnote 759:
Campbell, _Astroph. Journ._ vols. i. p. 49; v. p. 240.
Footnote 760:
Huggins, _Astr. and Astrophysics_, vol. xiii. p. 239.
Footnote 761:
Peek, _Journ. Brit. Astr. Assoc._ vol. ix. p. 260.
Footnote 762:
Rambaut, _Observatory_, vol. xxiv. p. 261.
Footnote 763:
_Ibid._ p. 360; Barnard, _Astroph. Journ._ vol. xiv. p. 152; _Monthly Notices_, vol. lxii. p. 61.
Footnote 764:
Campbell, _Astroph. Journ._ vol. i. p. 51.
Footnote 765:
Pickering, _Astr. and Astrophysics_, vol. xiii. pp. 40, 398.
Footnote 766:
_Astr. and Astrophysics_, vol. xiii. p. 311; _Astr. Nach._ No. 3211.
Footnote 767:
_Harvard Circular_, No. 1.
Footnote 768:
_Harvard Circular_, No. 4.
Footnote 769:
_Ibid._ No. 4; _Astroph. Journ._ vol. iii. p. 214.
Footnote 770:
W. J. Hussey, _Astr. Journ._ No. 383; _Publ. Pacific Society_, vol. viii. p. 220.
Footnote 771:
_Astroph. Journ._ vol. v. p. 233.
Footnote 772:
_Harvard Circular_, No. 42; _Astroph. Journ._ vol. ix. p. 269 (Pickering).
Footnote 773:
_Ibid._ p. 308.
Footnote 774:
E. C. Pickering, _Astroph. Journ._ vol. xii. p. 52; _Harvard Circular_, No. 56; _Astr. Nach._ Nos. 3651, 3664.
Footnote 775:
_Astroph. Journ._ vol. xii. p. 258.
Footnote 776:
_Harvard Circular_, Nos. 56, 57.
Footnote 777:
_Sitzungsberichte_, Berlin, 21 März 1901.
Footnote 778:
Rev. W. Sidgreaves, _Observatory_, vol. xxiv. p. 192.
Footnote 779:
_Monthly Notices_, vols. lxi. pp. 388, 462; lxii. p. 521.
Footnote 780:
_Ibid._ vol. lxi. p. 464.
Footnote 781:
_Harvard Circular_, No. 59.
Footnote 782:
_Yerkes Observatory Bulletin_, Nos. 16, 17.
Footnote 783:
This was assured by Campbell’s determinations (_Lick Bulletin_, No. 8).
Footnote 784:
_Lick Bulletin_, No. 8; Sidgreaves, _Astr. Nach._ No. 3741; Von Gothard, _ibid._ No. 3738.
Footnote 785:
_Astr. Nach._ Nos. 3752, 3753.
Footnote 786:
_Astroph. Journ._ vol. xiv. p. 167.
Footnote 787:
_Ibid._ p. 293.
Footnote 788:
_Lick Bulletin_, No. 10.
Footnote 789:
_Ibid._ No. 14.
Footnote 790:
_Astr. Nach._ No. 3756.
Footnote 791:
_Nature_, 30th Jan. 1902.
Footnote 792:
_Astr. Nach._ No. 3771.
Footnote 793:
_Astroph. Journ._ vol. xvi. p. 38.
Footnote 794:
_Astr. Nach._ No. 3603.
Footnote 795:
_Vierteljahrsschrift Astr. Ges._ Jahrg. xxxi. p. 258.
Footnote 796:
_Astr. Nach._ Nos. 3118, 3187, 3598.
Footnote 797:
_Nature_, vol. lxiv. p. 253.
Footnote 798:
The fifth and sixth stars of the trapezium have, however, certainly gained brightness of late. Comas Solà, _Astr. Nach._ No. 3751.
Footnote 799:
The radial velocity of η Geminorum proved variable on Campbell’s examination in 1902. _Lick Bulletin_, No. 20.
Footnote 800:
_Bull. Société Astr. de France_, Mars 1895, p. 85.
Footnote 801:
_Publicationen der Hamburger Sternwarte_, 1874, No. 1.
Footnote 802:
_Publicationem der Hamburger Sternwarte_, p. 79.
Footnote 803:
_Astroph. Journ._ vol. i. p. 11.
Footnote 804:
Roberts, _Celestial Photographs_, vol. i. p. 39.
Footnote 805:
_Der Sternhaufen_ χ _Persei_, 1878, p. 30.
Footnote 806:
_Phil. Trans._ vol. cxxiii. p. 373.
Footnote 807:
Webb, _Cel. Objects_, ed. Espin, vol. ii. p. 200.
Footnote 808:
_Astr. and Astrophysics_, vol. xiii. p. 180.
Footnote 809:
_Astron. Mittheilungen der kön. Sternwarte zu Göttingen_, Th. iv.; see also Schlesinger’s “Measurement of the Rutherfurd Photographs of the Præsepe Group,” _Contributions from the Columbia University_, No. 15, 1898.
Footnote 810:
_Harvard Annals_, vol. xxvi. pt. ii. p. 264.
Footnote 811:
W. C. Kretz, _Contributions from the Columbia University_, No. 16, 1900, p. 478.
Footnote 812:
_Harvard Annals_, vol. xxvi. p. 283.
Footnote 813:
_Transactions Yale Observatory_, vol. i. pt. i. 1887.
Footnote 814:
_Astroph. Journ._ vol. v. p. 352.
Footnote 815:
_Astr. Nach._ No. 3441.
Footnote 816:
_Astronomy and Astrophysics_, vol. xiii. p. 193.
Footnote 817:
_Astr. Nach._ Nos. 3018, 3032.
Footnote 818:
_Ibid._ No. 3074; _Publ. Lick Observatory_, vol. ii. p. 174.
Footnote 819:
_Journ. Brit. Astr. Assoc._ vol. ix. p. 133.
Footnote 820:
_Astr. Nach._ No. 3441.
Footnote 821:
_Ibid._ No. 3253; _Monthly Notices_, vol. lx. p. 258.
Footnote 822:
_Astr. Nach._ No. 3275; _Sirius_, 1891, p. 106. Wolf’s photographs were taken previously, but interpreted subsequently to Barnard’s.
Footnote 823:
_Pop. Astr._ Feb. 1899.
Footnote 824:
_Monthly Notices_, vol. lx. p. 259.
Footnote 825:
A. C. Maury, _Harvard Annals_, vol. xxviii. p. 20.
Footnote 826:
See _ante_, p. 230.
Footnote 827:
_Astr. Mittheilungen_, Th. iii.; quoted in _Observatory_, vol. xvii. p. 309.
Footnote 828:
_Bull. Société Astr. de France_, 1896, p. 293.
Footnote 829:
_Astr. Nach._ Nos. 3587, 3588.
Footnote 830:
Vogel, _Jahresbericht_, 1899.
Footnote 831:
_Monthly Notices_, vol. lvii. p. 16.
Footnote 832:
_Knowledge_, vol. xx. p. 194.
Footnote 833:
Clerke, _System of the Stars_, p. 284.
Footnote 834:
_Astr. Nach._ No. 3111; _Astr. and Astrophysics_, vol. xiii. p. 792.
Footnote 835:
_Astr. Nach._ No. 3535.
Footnote 836:
Cf. photographs of the cluster and nebula by Naegamvala, _Knowledge_,