372 Proceedings of the Royal Irish Academy. 



No. 454. Lacaille 6137 Cewtauei. — Dr. Gould suspects variation 

 of about half a magnitude in this star, and also in another star s f, La- 

 lande 6146 (E A 14}^ 48™ 23% S 33° 22'-l) {U. A., p. 269). 



!N"o. 455. |S TJes^ Minoeis. — 2 m. Ptolemy, Sufi, Argelander, and 

 Heis; Franks "bright 3 m.," April 14, 1878 {private Letter) ; 2-26 

 Pritchard (1882-363). Found to be variable from 2-2 to 2-8 by Espin 

 from observations in 1881 and 1882. He deduces a period of 10-6747 

 days with epoch of maximum, April 1882, 4*^-10 {Mon. Not., H.A.S., 

 April 1882). The star's magnitude for the greater part of its period 

 is 2-5 or 2-6. The minimum takes place two or three days before the 

 maximum. Observations confirmed by Pead. In the Cape Observa- 

 tions (p. 350) Sir J. Herschel gives observations on this star, and con- 

 cludes that it is certainly variable. He suggests a period of over ten 

 years. 2-13 and 2-0 H.P. 



No. 456. Lacaille 6198 Lupi. — 7 m. Lacaille ; 5 m. Harding; not 

 given by Behrmann ; variously estimated at Cordoba from 5-5 to 6-5 



(?)(Z7:^., p. 277). 



No. 457. Lalakde 27307-8 Bootis. — 7 and 9^ Lalande ; 7 Hard- 

 ing. My observations are : — 



March 4, 1878, about 7^ — equal to a star n p, but less than a 

 star s p. 



March 12, 1880, 7| — equal to the star n p, but less than the 

 stars p ; 7^ — equal to the star 7ip. 



No. 458. 20 LiBE^ ( = y Scoepii, Heis). — 3-4 Sufi, Argelander, and 

 Heis; 3 Houzeau (1875-10); 4-3 Behrmann; 3-5 Gould. Sir J. 

 Herschel estimated it 3-98 {Cape Ohs., p. 343); 5 m. Franks, "fine 

 orange," April 8, 1878; 3-4 Cape Catalogue (1878-41). Dr. Gould 

 calls it o- Librae. 3-25 H.P. 



No. 458a. 44 Bootis. — 5 m. Lalande ; 5-4 Heis ; 5*03 Pierce ; 

 4-65 Pritchard (1882-452). A binary star, 5, 6: 238°: 5", 1877. 

 "Webb says {Cel. Ohs., p. 244), " Struve and Argelander have found 

 variable light here." 4-90 and 4*8 H.P. 



No. 459. 47 (k) Bootis. — 4-9 Argelander; 5-4 DM; 5-6 Heis; 

 6-02 Pierce; 5A- Franks (very little < 44) April 21, 1878 {private 

 Letter). Pierce suspects variation. He says {Harvard Annals, vol. ix.), 

 " Argelander makes this star 4-9 ; I, 6-0. Sir William Herschel makes 

 it equal to 39 ; the D M 0-2 brighter; Heis 0-6 brighter; Argelander 

 0-9 brighter; and I, 0-1 fainter. July 27, 1875, at Munich, I inclined 

 to think it brighter than 39. April 7, 1876, at Berlin, I found it a 

 little brighter than 39, and made its magnitude, by comparison with 

 39, h and 134 Heis, to be 5-75." 5-57 and 5-3 H.P. 



Sir W. Herschel gives 44 , 47-39 and 47-40. 



March 4, 1883, I found 47 much inferior to 44 ; 47 about three 

 steps brighter than a 6 m. star closely s jo 44 ; 47 about = 39. 



