37 



Association at Nijmegen, Geographical Society at Paris. 

 Revue Politique, London Nature, R. Astronomical Society 

 and Meteorological Office, Boston Public Library, Prof. 

 Horsford, City of Boston, American Antiquarian Society. 

 Cornell University, Franklin Institute, American Pharma- 

 ceutical Association, House of Refuge and Water Commis- 

 sioners, Offices of the TJ. S. A*my and Census, Congressional 

 Library, TJ. S. Naval Observatory, and Mr. E. K. Price. 



The Committee on the Chess Knights' Tours was, on 

 motion, discharged from further consideration of the subject. 



Dr. Horn communicated papers on the " Revision of the 

 Species and Genera of the tribe Hydrobiini of the United 

 States," and " Revision of the Species of several Genera of 

 Meloidse of the United States." 



Prof. Cope exhibited the remains of a gigantic Probos- 

 cidian (Eobasileus) from Wyoming, and offered for publica- 

 tion in the Proceedings remarks on the Short-footed Unsu- 

 lates of the Eocene of Wyoming. 



Mr. Blodget read a paper on the Unperiodic Distribution 

 of Heat, suggesting the possibility of a Cosmical cause for 

 the exceptionally severe accesses of heat and cold in Ameri- 

 can districts. 



Mr. Lesley considered it needless to look beyond the recog- 

 nised phenomena of radiant heat through a dry atmosphere. 

 in connection with the perpetual presence of Arctic cold a 

 few thousand feet above the surface of the earth, in seeking 

 for the true explanation of " Texan Northers " and other 

 locally excessive cold spells. 



Dr. Horn gave his experience in Orme's Valley, California, 

 where the dryness of the air sometimes made a difference of 

 75° (seventy-five) F. between the wet and dry bulbs. On 

 such occasions the nights were always extra cold. 



After further discussion by Prof. Chase, the Minutes of 

 the last meeting of the Board of Officers were read. 



New nominations Nos. 715 to 728 were read ; and the 

 meeting was adjourned. 



