320 Proceedings of the Royal Irish Academy, 



No. 72. B. 51 Cassiopeia (=Arg. + 63, 369); 6-5 Argelander ; 8 m 

 Birmingliam, April 13, 1876. 



!N"o. 73. Lacaille 937 Hoeologh. — 6 m. Lacaille. Gould thinks 

 that the Cordoba "observations give strong reasons for suspectiDg 

 variability," the estimates ranging from 6-0 to 6-7. He calls its colour 

 " strikingly red." 



jSTo. 74. 21 Peesei. — 4, 5, and 6 m. Lalande (5415-17); 5 m. Heis. 

 5i Pranks, Nov. 29, 1877. Sir W. Herschel found 21 equal to 17 

 Persei. Nov. 21, 1876, I found 21 Persei slightly brighter than 17 : 

 March 4, 1883, 21 decidedly less than 24 (5-6 Heis)— at least 0-2 

 mag., and four steps less than 17 Persei, or about mag. 5'6 ; Dec. 6, 

 1883, two steps less than 24 Persei. 5-20 and 4-9 H.P. 



No. 75. t/Eeidaki. — 3 m. Ptolemy, Tycho Brahe, and Hevelius ; 

 4-3 Sufi ; 4 Ulugh Beigh ; 4-50, Sir J. Herschel {Cape Oh., p. 345) : 

 3 m. Heis ; 3 m. Franks (Nov. 28, 1877) ; 3-7 Gould. Smyth remarks 

 {Bedford Catalogue, p. 73), "3 pale yellow, and not of a brightness 

 corresponding to its rated magnitude." Jan. 28, 1876, I found 

 77 = e Eridani, but slightly less than TT Ceti ; Nov. 14, 1876, t; Eridaui 

 slightly brighter than tt Ceti. 3-95 H.P. 



No. 76. 47 Aeietis. — 6 m. Lalande (5453) ; 6 m. Harding; 6 m. 

 Heis. Not in Ai'gelander's Uranometria ; 4-8 Sir W. Herschel (Pierce) ; 



6 m, Pranks, Nov. 29, 1877. 5*88 and 5*6 H.P. 



Nov. 24, 1878, 1 found 47 very slightly brighter than p^ Arietis. 

 Oct. 6, 1879, 47 brighter than p^, but less than p^ 

 Mar. 3, 1883, 47 two steps less than p^ 



No. 77. e Aeietis. — 5 m. Sufi; 4^, 5 Lalande; 4 Harding; 6 

 Bessel; 4-5 Heis and Houzeau ; 5*0 Gould; 5 Pranks Nov. 29, 1877 ; 

 4"24 Pritchard (1882*704). It is a close double star, and Struve sus- 

 pected the components of variation. Sir W. Herschel gives the 

 sequences I.^.t"- and e , S. Eeb. 1877, I found e brighter than {, and 

 not much below S ; March 3, 1883, e 2 steps brighter than {. Dr. 

 Gould suspects variation. 4"58 and 4'7 H.P. 



No. 78. Bradley 396 Cassiopeije. — 4-5 Lalande, Nov., 1789, and 



7 m. March, 1790; 7 m. Groombridge ; 6 Carrington and Heis; 5-5 iu 

 D M {Nature, Dec. 30, 1880). March 14, 1884, 1 estimated it 6-2m., 

 2 steps less than 784 B.A.C. (6 m. Heis). 



No. 79. 5 Eeidani.— 6 and 5| Lalande (5546-49) ; 6 Harding ; 

 5-6 Heis ; 5-4 Gould ; 6 Franks, Nov. 28, 1877. Espin says, " seems 

 liable to sudden changes of magnitude " {private letter). Feb. 17, 1884, 

 I estimated it 5'4 m. 



