18 
April 14th. 
President Newberry inthe chair. Twelve persons present. 
The PRESIDENT made some remarks on the explorations of 
Major Powell in Utah and Arizona, referring to his impor- 
tant scientific determinations in regard to the possibility of 
navigating the Colorado River, to his descent of that stream 
from Grand River down through the Great Cafion, and to his 
researches among the aboriginal tribes. The Utes, Pah-Utes, 
Moquis, Shoshonees, and Comanches, who occupy the region 
over which his travels extended, are probably all branches of 
one great family of Indians. Major Powell is projecting a 
work on these tribes, when he returns to the States. 
Dr. H. C. Botton made some remarks which may be 
entitled “Preliminary Notes on New Salts of Uranium.” 
He exhibited specimens of thallium uranate, thallio-uranic 
sulphate, thallio-uranic acetate, rubidio-uranic sulphate, and 
rubidio-uranic acetate, and compared them with specimens of 
other compounds analogous and already known. 
He stated that he had sought to form the basic ammonio- 
uranic sulphate described by M. Becquerel, in the Comptes 
Frendues, and the preparation of which he thought erroneously 
given. He had obtained a sub-sulphate of uranium and 
ammonium, and in conjunction with his friend, Prof. Henry 
Morton, had examined its fluorescent spectrum. This spec- 
trum is not continuous, as was claimed by M. Becquerel for 
his compound. Dr. Bolton had determined the exact compo- 
sition to be: 
2 (Us SOc) + (NHi)280,, 
and proposed the name ammonio-di-uranic sulphate. It was 
obtained by the action of heat on the normal ammonio- 
uranic sulphate. 
Pror. SEELY announced that the bichloride of tin is a 
solvent for all the petroleum oils, and that hence this sub- 
stance might be found highly useful in purifying the hydro- 
carbons of the marsh-gas series. 
