368 Proceedings of the Royal Irish Academy. 



than I DracoBis, equal to 8 Ursse Majoris, and rather brighter than 

 K Draconis." Smyth {Bedford Catalogue, p. 213) says, "I have had 

 it in view many times, and always looking like a small third, though 

 Baron de Zach but shortly before classed it 2-3." 3-63 H.P. 



No. 424. — YiEGiNis. — Observed at Markree as 11 m., April 17, 

 1855 ; 9 m. on the Paris charts, No. 43, but observed by Palisa only 

 12-5-13 m., April 2, 1880. It was observed by Peters as 11 m. on 

 several occasions 1870-1880, and he thinks the variability doubtful 

 {Ast. NacTi., 2360). 



No. 425. Lalande 26031 Vieginis. — 5 m. Lalande and Harding, 

 4-8 in D.M. Heis identifies his No. 145 of Virgo with LL 26031, but 

 this seems to be a mistake, the following star (No. 146) being appar- 

 ently identical with LL 26031. Heis rates this latter star 5-4. The 

 Cordoba estimates vary from 4' 8 to 5-5, and Dr. Gould thinks "the 

 discordance is altogether too large to be attributed to errors of observa- 

 tion " ( U. A., p. 320). On April 7, 1884, I estimated this star 5-1 m. 

 —one step brighter than LL 26302 (5-2 Gould). 4-97 H.P. 



No. 426. 15 Boons. — bh Lalande; 6 Harding; 6 Argelander; 

 6-5 Heis; 5"5 Gould at Albany, and 5'8 at Cordoba; 6 m. Franks 

 (=14) April 11, 1878 {private letter). April 2, 1884, I estimated it 

 5-7 — one step brighter than 18 Bootis ; April 6, 5-6. 



No. 427. a Boons (Aectukus). — Sir J". Herschel found it brighter 

 than Capella, April 14, 1838 {Cape Ols., p. 325). Schmidt finds 

 Arcturus variable in colour ; 0-34 Pritchard (Oxford), and 0*27 (Cairo) 

 1883 (Capella being 0-08 and Yega 0-18 on the same scale). 0"03 and 

 0-3 H.P. 



April 3, 1883, I observed Arcturus unusually bright — about half 



a magnitude brighter than Capella. 

 April 20, 1883, Arcturus seemed not quite equal to Capella. 

 April 23, 1883, Arcturus = Capella. 



May 16, 1883, Arcturus about 0-2 m. brighter than Yega. 

 July 27, 1883, Arcturus distinctly superior to Yega, although 



Yega was at a much higher altitude (9-15 P M). 

 April 7, 1884, Arcturus about exactly equal to Capella, and of 



the same colour. 



No. 428. AY.B. 143 Yirginis. — 'Botva. Lalande' s Catalogue; 6 m' 

 Harding. It is No. 153 of Yirgo in Heis" Catalogue, where it is rated 

 6 m.; 7 m. Bessel. The Cordoba estimates vary from 6*0 to 6-6 m. 



No. 429. Lacaille 5891 Lirpi. — 5^ m. Lacaille ; 6-5 Behrmann, 

 5-7 at Cordoba ; 5-6 Cape Catalogue, 1877-47. Suspected to be vari- 

 able by Houzeau, who says {Annals of the Brussels Observatory), "Le 

 numero 1202 de Lacaille dans la constellation du Loup (No. 5891 du 



