Trans. N. Y. Ac. Set. 168 May 22, 



the syrup, when ready to crystallize, is strained through a flannel 

 filter, and this substance is thus obtained, as a fine white or buff" 

 crystalline powder. He had long known it, as obtained rarely 

 and in small amounts at Hanover, N. H., in the mica-slate re- 

 gion ; while from the towns in Vermont, where the rocks are 

 more calcareous, it is common and abundant. At Williamstown, 

 there are springs that deposit calcareous tufa. 



The substance is popularly called "sap-sand" and "sugar- 

 nitre ;" in Steele's " Fourteen Weeks in Chemistry," it is referred 

 to as silica ! 



The President remarked upon the power of plants to select 

 their food from the soil, and to form organic salts by laws and 

 processes as yet largely unknown to us. 



Various minerals were exhibited by Mr. G. F. Kunz and Mr. 

 W. L. Chamberlin. 



Capt. J. H. Mortimer showed specimens of granite, compact 

 and disintegrated, and of the resulting kaolin, from the Island 

 of Jersey ; also, a specimen of the red syenite, of tlie Egyptian 

 obelisk set up on the banks of the Thames, similar to the one 

 now here. 



The subject of the disintegration of granites and the produc- 

 tion of kaolin, was further remarked upon, and examples cited 

 from various localities [Mystic, Conn., the White Mountains and 

 New York Island], by the President, Prof. O. P. Hubbard and 

 D. S. Martin. 



A paper by Mr. Israel C. Russell, was then read by Prof 

 Mar riN, entitled : 



sulphur deposits in UTAH AND NEVADA. 

 Sulphur deposits of sufficient extent to attract attention from their 

 economic importance have been visited by the writer at three localities 

 in the Great Basin. These are located at Cove Creek, Mil'ard County, 

 Utah; near Humboldt House, Humboldt County, Nevada; and at 

 Rabbit Hole on the eastern edge of the Black Rock desert in North- 

 western Nevada. 



Sulphur Deposits at Cove Creek. 

 Of these deposits, the most interesting to the geologist are those oc- 

 curring at Cove Creek in Southern Utah. This locality is on the eastern 

 border of the Great Basin and at the western edge of the region of the 

 high plateaus recently described by Captain DUTTON. Eastward is a 



