107 



well-known British ichthyologist, specimens of our species, and 

 wished him carefully to compare them with the English fish. 

 The remarks of that gentleman upon this species, which will 

 appear in Dr. S.'s " Synopsis," show the species to be distinct 

 from each other, and that our fish is Lesueur's O. viridescens. 



Dr. A. A. Gould remarked upon the occurrence of Esox 

 lucius in Connecticut River, as stated by Dr. Storer. 



He said that he hoped that Dr. S. would give the subject a 

 very thorough examination, before he admitted this as a fact. He 

 had himself, after much consideration, and with favorable oppor- 

 tunities for observation, adopted the opinion that no fluviatile 

 species exists both in Europe and North America. He con- 

 sidered the North American species to be quite distinct, and that 

 the fish which had latterly been thought to be Cotius gobio, of 

 Europe, would prove ultimately to be specifically distinct from it. 

 Great caution should be exercised in admitting the identity of any 

 foreign species with our own. 



Mr. John E. Teschemacher read mineralogical notices of 

 Damourite and Pyrrhite, minerals that had recently been 

 examined by him. 



Mr. T. stated that, in the Annales de Chimie for Oct., 1845, 

 there is a paper, from M. Achille Delesse, on a new mineral 

 found among the Kyanite of Pontivy, which he had named 

 Damourite. It is a combination of silicate of alumina and 

 hydrate of potash. His analysis gives : 



Silica, 45.22 



Alumina, 37.85 



Potash, 11.20 



Water, 5.25 



99.52 



In the closed tube, before the blowpipe, it gives off water. This 

 mineral appears, either during its formation or afterwards, to 

 have undergone intense pressure. 



Among the minerals from Chesterfield, Mass., which, in a 

 paper read before this Society, and published in their Journal, 

 Vol. IV. No. 1, Mr. T. had considered as new and requiring in- 



