188 Proceedings of the Royal Irish Academy. 



102. S SEEPEifTis. — SciLonfeld gives the followiag fomiula derived 

 by Argelander : — 



Max. Ep. £. = 1849. 5. 17-39 + 362'i-303 ^- 0-188836 E-, 

 ■wMcli represents Tvell tlie earlier observations of the star up to 1860 ; 

 but siaee that year deviations are shown, amonntiiig in 1874 to 80 

 days. The nniiorm period of 361 days shows also considerable devia- 

 tions fi'om observation, amounting to 76 to 100 days too late in Hard- 

 ing's time, and for Lalande's time as much too early. The minimum 

 occurs much nearer the following maximum than the preceding one. 

 Schonfeld calls its colour " sehr roth," and notes an 11 m. star «j?., 

 and a 12-7 m. star nf. 



103. S CoROX^. — The elements derived by Schonfeld from 13 

 maxima and 9 minima show irregular faults up to 20 days, but agree 

 with the supposed in^•isibility of the star to Lalande and Bessel, 1794, 

 April 30, and 1828, Hay 20. 



104. T Llbk^. — Discovered to be variable by C. H. P. Peters, 

 from obseiwations at Clinton (U.S.A.), 1877-1880. Attunes he found 

 it completely invisible in very clear air, and deduces a period of 310 

 days, or perhaps half this (Ast. l^ach., Is'o. 2360). 



105. TJ LiBH^. — Discovered to be variable by C. H. P. Peters, 

 from observations at Clinton, 1878-1880. He found it invisible in his 

 telescope on the following dates: — 1879, May 16; 1880, May 3, 

 June 3 ("ganzlich unsichtbar") ; July 10 ( " unsichtbar, obgleich die 

 Luft ausserordentlich schon"); and easily visible on the following 

 dates, when he compared its brightness with neighbouiing small 

 stars :— 1878, June 19, 27, and 28 ; 1879, June 18, July9 (" ganz 

 hell"), August 10 ; 1880, July 24, 27, and 31, and August 27 ("hell, 

 und in die Augen fallend "). He derives a period of about 380 days, 

 or perhaps half this (A. jSI"., 2360). 



106. Oe Aeg. 14782 LrsE^. — Discovered to be variable by C. H. 



P. Peters, at CHnton, P.S., from observations, 1878-1880. He found 



it invisible in his telescope on the following dates: — 1879, June 18, 



July 8 (" sehr klare Luft ") ; 1880, August 27 ; and easily visible on 



the following dates, when he compared its brightness with small stars 



in the vicinity :— 1878, June (-" ungefahr 12. Gr."), July 5 (=0e Arg. 



14784), July 22 and 27, and August 3 ; 1879, May 17 and August 11 ; 



1880, April 20, May 3 and 11, June 2 and 28, July 10, 24, and 31. 



He fixes a maximum for 1880, May 18, and deduces a period of 



684 , 

 — days. 



107. E, CoEOifiE. — A very irregular variable, often remaining for a 

 whole year at a maximum, or minimum with scarcely perceptible 

 change. Frequently, however, a very quick light decrease takes 



