Miscellanies. ' 159 



tals of pure muriate of soda, I can now announce witli perfect as- 

 surance, having proved it by numerous specimens. And in all these 

 rocks none of the salt could be detected ; but its constituents could. 

 That pseudomorphous crystals, perfectly imitating the artificial hop- 

 per-form crystals of these vats, are found in lias feri'iferous and salif- 

 erous rock, is now well known. Let each chemical philosopher de- 

 duce his own inferences. 



(To be continued.) 



2. Proceedings'^ of the Lyceum of JVoiural History, ofJYew York. 

 (Continued from Vol. XVIII, p. 195.) 



March, 1830. — The anniversary discourse was pronounced by 

 Prof. J. A. Smith. Specimens of hornblende crystals in a siliceous 

 rock from Chester, (Mass.) were presented by Mr. Jessup. Gov. 

 Houston presented a fossil crab from the Dismal Swamp, Virginia, 

 very nearly allied to Cancer undecim dentatus, of Latreille. Mr. E. 

 Thompson was elected a resident member. 



April. — Dr. Feuchtwanger read an account of Drebriden's 

 scale of chemical equivalents, and a translation of Frederick Hoff- 

 man's observations on the reciprocal relations of the antediluvian 

 flood. Dr. Torrey presented bronzite, (Clintonite,) from Orange Co. 

 N. Y. Mr. Cooper made a detailed report upon the several species 

 of fresh water shells in the cabinet of the Lyceum. These have 

 been presented at different times by Mr. Barnes, Dr. Eights, 

 Messrs. Cooper and Cozzens, and Prof. Troost of Nashville, Ten- 

 nessee. There are now twenty seven species of the genus Unio, 

 and five species of Symphonota of Lea. The genera Alasmodonta 

 and Anadonta will form the subject of a future report. Several un- 

 determined species were referred to Messrs. Cooper and Lea, for 

 examination and report. Dr. Dekay offered some additional obser- 

 vations upon the teeth of the Mosasaurus, and exhibited the vicarious 

 or replacing tooth of this fossil reptile. He also exhibited another 

 specimen of Coprohte from New Jersey, and compared it with fossil 

 casts of Terebrum, with which it had been confounded. Dr. Ho- 

 sack presented a collection of plants from Mauritius, prepared by 

 Mr. Telfair. Dr. Van Rensselaer read a paper on the animal poi- 

 sons of the United States. Colonel Dekay presented specimens of 

 emerald in its gangue from the celebrated mines near St. Fe de 

 Bogota, (Colombia.) Mr. Cooper read a paper on two young skulls 



* Forwarded for the last number but received too late for insertion. 



