Gore — On Suspected Variable Stars. 383 



a long period." Sir J. Herschel made y Sagittarii 0"2o m. fainter than 

 TT Scorpii, whereas Dr. Gould makes y 0*6 m. the brighter of the two. 

 Septembers, 1874, I f ound y very nearly, but not quite equal to 8 

 Sagittarii. 



jN'o. 540. Lalande 33212 Heeculis. — 7 m. Lalande and Harding. 

 I could not see any trace of this star with the binocular, April 27, 

 1878. 



No. 541. O.A. 17670 Sagittakii. — Rated 4^m. by d'Agelet in 

 1783, and estimated 5, 7 and 5^ by Argelander. The Cordoba estimates 

 vary from 5*8 to 7. It is not given by Lalande or Heis. It is 6 m. 

 in Sa/rding's Atlas, and marked with a line under it. 5-93 H.P. 



No. 542. 72 Ophiucii =0 5 342.-3-4 Heis; 3-6 Gould; 3*92 

 Pritchard (1882-483). A supposed close double star, the companion 

 being suspected of variation. It was discovered as a double star on 

 November 1, 1841, mags. 4, 7, but was seen single on May 14, 1842. 

 If was again seen double 1842-72, but was again found single in 1844, 

 1845, 1848, 1850, 1851, 1852, and 1859. In 1876, however, M. Struve 

 again saw the satellite very distinctly, position 156°-0, distance l"-6, 

 and considers that the star is really double, but that the companion is 

 subject to great fluctuations of light. In 1859, Secchi found the star 

 well separated, only 3 weeks before it was found single at Pulkowa! 

 {Nature, April 10, 1879). Burnham found it "certainly single ; first- 

 class night" (1880-592) with 18|- inch refractor {Memoirs, R.A. S., 

 vol. xlvii., p. 296). 



No. 543. Birmingham 427 Sagittaeh. — 8ni. Lalande (33287); 

 8 m. d' Arrest ; 8 and 7-5 Argelander; 8-3 Birmingham, 1875, May 

 26, and 8 m. July 25, but not seen 1876, April 13. 



No. 544, Lacaelle 7646 Scorpii. — 6J Lacaille ; 7-6 Cape Catalogue 

 (1878-61). Suspected variable by Gould, but the evidence derived 

 from the Cordoba observations is conflicting, owing to the apparent 

 variation of several of the comparison stars ( U. A., p. 288), 



No. 545. Tarnall 7736 Sagittarii. — 5|- m. Yarnall, 1868, June 

 26, and 7^m., July 1. Rated 6-4 at Cordoba in April and May, 1877, 

 but not observed in 1871-73. It is not in Lalandis Catalogue, but 

 is 9 m. in Harding^ s Atlas. 



No. 546. Lacaille 7681 Sagittarii (= Lalande 33732). — 6|- 

 Lacaille ; 6 Lalande ; 7, 6, and 6|- Argelander ; 6-0 and 5-7 Yarnall 

 (1868). Not given by Heis or Behrmann. The Cordoba estimates 

 are 6-7 and 7-0; and Gould says "the star appears clearly to be 

 variable, and I regret my inability hitherto to secure determinations 

 of its limits of magnitude." I observed this star August 6, 1877, and 

 estimated it exactly equal to Lacaille 7660 (6-9 m. Goidd). 



