34 BULLETIN OP THE 



the whole the expedition was successful, the contacts at ingress 

 and egress having been observed, and a number of intermediate 

 measurements made. On account of cloudiness of the weather, 

 Prof. Young was unable to make observations with the spectro- 

 scope. 



Mr. J. W. Powell read a communication 



ON THE UINTAH MOUNTAINS, 



in which he offered an explanation of the formation of the canons 

 in the southwest. 



Prof. E. M. Gallaudet, 

 Cora'r Lester A. Beardslee, U. S. N., 

 Mr. A. N. Skinner, 

 Mr. Robert Lawrence Packard, and 

 Lieut. C. C. WoLCOTT, U. S. A., 

 were announced as having been elected members of the Society. 



84th Meeting. March 13, 1875. 



The President in the Chair. 



Forty members and visitors present. 



Dr. A. WoEiKOFP, of Russia, by request of the President, 

 communicated 



THE RESULTS OP A RECENT DETERMINATION OP THE ELEVATION 

 OF THE CASPIAN AND ARAL SEAS, 



by Col. TiLLO, of the Russian Staff Corps. 



(a BSTR ACT.) 



The levelling between the Caspian and Aral Seas was made 

 in 1874 under the direction of Col. Tillo. It gave 243 feet dif- 

 ference between the two. The Caspian is considered to be 89 

 feet below the level of the Black Sea; thus the Aral Lake is 154 

 feet above the Black Sea. It was also proposed by the former 

 secretary of the Russian Geographical Society, Wenioukef, to 

 run a line of levels along the Bosphorus, so as to determine the 

 elevation of the Black Sea above that of Merraara. 



It is probable an expedition will start this year to level the 



