392 Proceedings of the Royal Irish Academy. 



by Gould, although it is included in his list o£ " Standards of Magni- 

 tude" {U. A., p. 33). Sir W. Herschel gives 47 (x) •52(7r) -61 (<^). 

 In August, 1875, I found tt slightly fainter than o Aquilse. 



'Bo. 603. e Pavonis.- — 4 m. Lacaille ; 4-3 Behrmann ; 4-33 Sir J. 

 Herschel {Cape Obs., p. 344); 4 m. Cape Catalogue {1S7 4-69). The 

 estimates of magnitude at Cordoba vary from 3-6 to 4-2, and Dr. Gould 

 says it " is of a remarkably blue colour." 



No. 604. Lalande 37868 VtrxPECUL^. — 5 m. Lalande ; 5-7D. M.; 

 5-6 Heis ; not in Argelander's TJranometria. According to Schmidt 

 (A.N. 2219), it is Bessel Weisse, 1501, 7m.; early in September, 

 1878, he estimated it 6*75, and says its visibility is difficult owing to 

 its being in the neighbourhood of another 5 m. star (13 Yulpeculse). 

 It is 6 m. in Sarding''s Atlas. On October 6, 1879, I found this star 

 less than 12 Vulpeculae (6-5 Heis), and about equal to 14 Yulpeculse, 

 ■or about 6 m. ; slightly less than a star s.f. 



No. 605. 9 SAGiTTiE. — 6 m. Lalande (37856) ; 6-7 Heis ; not in 

 Argelander's TJranometria. Sir W. Herschel gives 8 (^) - 9. 



No. 606. e Dkaconis. — 4-3 Sufi ; 4 Argelander ; 4-3 Heis; 4m. 

 Franks (> tt), September 11, 1877 {private letter); 3-72 Pritchard 

 (1882-371). A probable variable. From observations in 1882-83, 

 Gemmill infers a probable period of 68 days +, vt^ith a maximum about 

 end of March, 1883. His estimates of magnitude vary from 3*8 to 4-8. 

 It is a double star (5*5, 9-5 : 361°*4 : 2""9), and the companion has also 

 been suspected of variation. 



December 13, 1876, I found it a little brighter than tt (5 m. Heis). 



April 9, 1883, e one step less than x, and more than half a magni- 

 tude brighter than tt, or about 4'0 m. 



March 4, 1883, e = x Draconis, or 3"9; March 18, one step less 

 than X or 4*0 ; April 2, 1884, two steps less than ^ or 4*1. 



No. 607. /3 AauiL^. — 3 m. Ptolemy ; 3-4 Sufi ; 3 Lalande ; 

 4 Hevelius and Harding, Argelander and Heis. Sir W. Herschel gives 

 8, /?. 7? ; 3-92 Sir J. Herschel ; 3-9 Gould ; 3^ Franks, Aug. 29, 1877 ; 

 3-67 Pritchard (1882-589). Smyth says {Bedford Catalogue, p. 464) :— 

 " It is not now so bright as y or S, which could not have been the case 

 in Payer's time. Ptolemy marked it y in brightness, as did also Ulugh 

 Bcigh, Tycho Brahe, Bradley and Lacaille ; Flamsteed, Piazzi and 

 Zach rate it 3|- ; but Hevelius could enter it no larger than the 4th 

 magnitude." 3-95 H.P. 



No. 608. 10 Sagittj];.— 6 m. Lalande (38016); 6-5 Heis; 6 m. 

 Franks, Aug. 30, 1877. Sir W. Herschel gives 11, 10-15. 



Oct. 7, 1879. I found 10 about half a magnitude less than 11 

 Sagittoe (Heis 6 m), or 6-5 m. 



Nov. 2, 1879. 10 two steps less than 1 1 , or 6-2 m. ; Nov. 2, 1882, 

 €•2. 



