157 



Sander Rang. Manuel des Mollusques et de leurs Coquilles. 

 18mo. Paris, 1829. Same. 



Gould, John. Monograph of the Odontophorinse, or Partridges 

 of America. Part II., folio. London, 1846. Same. 



Gray, George R. Genera of Birds. No. 26, folio. London, 

 1846. Same. 



Annals and Magazine of Natural History, for June, 1846. 8vo. 

 London. Same. 



American Journal of Science and Art. New Series. 8vo. 

 No. 4. New Haven, July, 1846. From the Editors. 



July 15, 1846. 



The President in the Chair. 



Letters were read from Caleb G. Forshey, Esq., of Vida- 

 lia, La., and John G. Norwood, M. D., of Madison, Ind., 

 severally acknowledging the notice of their election as cor- 

 responding members ; and from B. B. Brown, M. D., of St. 

 Louis, accompanying a donation. 



A letter from Professor Oliver P. Hubbard, of Dartmouth 

 College, relating to a singular diseased affection of the 

 perch, Perca flavescens, was read. 



It appeared from information received by Prof. Hubbard, that 

 about sixteen years since, this fish was transferred by Mr. M. C. 

 McCiure, of Ackworth, N. H., from Warren's Pond, in Alstead, 

 to Cold Pond, ten miles further north, in Ackworth and Unity, 

 the last named pond being at that time destitute of this species. 

 Both ponds are at this time well stocked with it, but the perch of 

 Cold Pond are not edible by reason of numerous cartilaginous 

 concretions which are diffused throughout the body of the fish, 

 while those in Warren's Pond, from which they are derived, 

 have never exhibited this peculiarity. These concretions are 



