88 



Dec. 20, 



posited with the Numismatic and Antiquarian Society was 

 received from Mr. Davis, Curator. 



Donations for the Library were received from the Mel- 

 bourne Mining Survey Office; Russian Geographical So- 

 ciety; Paris Geographical Society and Revue Politique; 

 Bordeaux Commercial Geographical Society ; London Na- 

 ture ; Boston Society of Natural History ; Rhode Island His- 

 torical Society ; Brooklyn Entomological Society ; Franklin 

 Institute ; Medical News ; Journal of Pharmacy, and E. D. 

 Cope, Philadelphia ; United States Department of the In- 

 terior, and Engineer Bureau, Washington ; Mexican Agri- 

 cultural Bureau, and M. C. Brogniart. 



Gen. Russell Thayer read, pursuant to notice, a paper 

 on the "Movement of Troops in Cities in cases of Riot and 

 Insurrection." On motion of Mr. Price, seconded by Mr. 

 Roberts, 1000 extra copies were ordered to be printed for 

 general distribution. 



Prof. Frazer exhibited and described a magnified colored 

 picture of the crystals in a transparent slice of trap from 

 Lancaster county. 



Mr. Briggs explained away the difficulties about the 

 amount of heat developed in the working of ice machines, 

 which he had brought before the notice of the Society at a 

 former meeting, by reference to a pamphlet transmitted to 

 him from Paris by M. Pictet. 



The Annual Report of the Committee on Finance was 

 read and approved, and the resolutions recommended there- 

 in were moved and adopted. 



Pending nominations 871, 872 and nomination 873 were 

 read. 



Ami the meeting was adjournal. 



