Reiclienbach ] 234 [June. 



logical Societies, and Society of Arts, of London ; the Bu- 

 reau des Fonts et Cliauss^es in Paris ; the San Fernando 

 Observatory ; Dr. Koch and R. Friedlander & Son, of Ber- 

 lin ; J. Kreittmeyer, of Munich ; Professor Agassiz, of Cam- 

 bridge, Massachusetts; Professor Hall, of Albany; the New 

 Jersey Historical Society ; the Franklin Institute ; Messrs. 

 Blanchard & Lea, J. F. Fisher, T. P. James, C. B. Trego, 

 0. Reichenbach, and F. Leypoldt, of Philadelphia ; Mr. J. 

 Lacey Darlington, of Westchester ; and the Wilmington In- 

 stitute. 



No. 69 of Volume IX of the Proceedings, just published, 

 was laid on the table by the Secretary. 



The death of C. G. C. Reinhardt, of Leyden, a member of 

 the Society, was reported by the Secretary. 



A communication intended for publication in the Transac- 

 tions was presented by Mr. T. P. James, entitled, "On the 

 Mosses of California," by Leo Lesquereux, of Columbus, 

 Ohio, and referred to a committee, consisting of Mr. James, 

 Mr. Durand, and Dr. Bridges, with instructions to report at 

 their earliest convenience. 



Communications " On Solar Spots," and " On Breaks in 

 tlie Visible Record of History of the Variation of Species," 

 by Dr. Reichenbach, were read by the Secretary. 



SOLAR SPOTS. 



Br Dk. 0. Reichenbach, Philadelphia. 



Going over the last volumes of the '' London, Edinburgh, and 

 Dublin Magazine of Sciences," 1 remarked in the number for Decem- 

 ber, 1860, an article by J. Gregg, F.G S., on solar spots, in which 

 he mentions that Mr. Wolf has in the " Coraptes Rendus," January, 

 1859, renounced the idea that this phenomenon might be connected 

 with the planetary motions. He finds the hypothesis likely, but 

 must admit that the period of spots, which he presumes to be 11.1 

 years, is not in accordance with that of the revolution of Jupiter, 

 that the maximum does not at all coincide with the perihelion of 

 that planet — rather the contrary — and that he has not been able to 

 lind amongst astronomical combinations a period of 11.1 years. 



