200 Proceedings of the Royal Irish Academy. 



I have made tlie foUoTving observations of the relative brightness 

 of 34 Cygni, compared -with neighbouring stars : — 



November 9, 1876, . . 34 brighter than 36 Cygni, but less than 



29 Cygni. 



August 1, 1877, . . 34 brighter than 36, and very slightly 



brighter than 29. 



_ April 19, 1878, . . . Brighter than 36, but slightly less than 



29. About equal to 28 Cygni. 

 November 12, 1882, . 34 equal to 28 Cygni. 



163. IT CrGia. — Schonfeld says that his observations of this star 

 do not agree with those of Knott. A blue star 8"9 m. nf., which 

 Birmingham believes to be slightly variable. 



164. E Cephet. — Identified by Pogson, with 24 Hevelius Cephei 

 (5 m.), and Schonfeld and Johnson consider this identification correct. 

 In 1859, it was, according to Schonfeld, only 9'10 m., and since 1865 

 varying between 8 m. and 8*6 m., with a period somewhat shorter 

 than a yeai^, and a maximum in November or December. Prom the 

 recorded observations, Pogson deduced a period of 73 years. In 

 August and September, 1838, Parley saw it bluish, and considerably 

 less than A. Ursse Minoris. Johnson observed in 1840, August 22 and 

 September 1, with the meridian circle of the Eadcliffe Observatory, 

 and noted it " 10th mag., scarcely visible.' In September, 1847, he 

 estimated it 8*5 m., and it was easy to observe. In the 3 following 

 years, it was only seen very faint, between the 9th and 10th magnitudes. 



In Carrington's Bedhill Catalogue, it is No. 3138, and rated 8*5 m. 

 Its position for 1855 is given as E. A. 20^ 34'" 37^-1, and N. P. D. 

 1° 18'59"'l (with the note "Proper Motion"), agreeing closely with 

 Schonfeld's place. In the Eadcliffe Catalogue for 1860, it is 8-3 m. 

 (No. 2000), and its position for 1860 E. A. 20'^ 31" P-52, and N. P. D. 

 1° l7'58"-2. In the Washiiigton Catalogue for 1871, E Cephii seems 

 to be No. 8960 (= B A C 7184). The position given agrees closely 

 with Carrington's place for his No. 3138. In Hon. Notices R, A. S. 

 for May, 1856, it is stated that E Cephei has been confounded by 

 Lalande and other astronomers with X Ursse Minoris ; but Pogson has 

 shown it to be in reality identical with Groombriclge 3402. (In 

 Groombridge's Catalogue, No. 3402, it is rated 5 m. ; and its position 

 for 1810 is given E. A. 21*^ 2°^ 26'-48, N. P. D. 1° 29' 10"-3.) 



By comparisons with the star Carrington 3082 (south of it) on 

 15th March, 1880, and 30th March, 1881, I estimated the magnitude 

 of E Cephii at 8-5. It was estimated about the same by the Eev. T. 

 E. Espin, on April 6, 1880 {private letter). 



