226 f^p"'- 



the polariscope and the sky, will frequently show a neutral point 

 which is otherwise invisible. 



The normal polarity is often reversed by a stratum of clouds of 

 uniform thickness, especially within the solar primary lemniscate. 



Pending nominations 541, 547, 548, 549, were read. 



On motion of Mr. Fralej, the subject of Dr. Genth's con- 

 ditional donation of ten volumes of Leonhard & Bronn's 

 Jahrbuch fiir Mineralogie 1840-1851, was referred to the 

 Library Committee with power to act. 



On motion of the Librarian it was resolved that the Secre- 

 taries be authorized to subscribe for the Bulletin Interna- 

 tional de rObservatoire Imperial de Paris. 



And the Society was adjourned. 



Stated Meeting, April 20, 1866. 



Present, twenty-three members. 



Dr. Wood, President, in the Chair. 



A letter of envoi was received from the Geological Bureau 

 of Sweden, dated Stockholm, November 6th, 1865. 



Donations for the Library were received from the Geo- 

 logical Survey of Sweden, the Geographical Societies of 

 ^France, the Royal Astronomical and Meteorological So- 

 cieties of London, the Bombay Branch of the Royal Asiatic 

 Society, the Boston Natural History Society, the Rhode 

 Island and New Jersey Historical Societies, the Franklin 

 Institute, and the Publishers of the Medical News, Phila- 

 delphia. 



The Committee to which was referred "a Map represent- 

 ing five types of topography," reported in favor of its pub- 

 lication in the Transactions, which, on motion, was so ordered. 



Dr. Le Conte exhibited a piece of lithographic stone found 

 in Northern Alabama, similar to the hardest or blue variety 

 of German stope, from a quarry used by the Rebel Govern- 

 ment for printing its treasury notes, specimens of which 

 accompanied the stone. 



