Geology. 325 
but the tones veased immediately when the rays were cut off b 
, Pp 
of gases which have a strong absorptive power. The author 
closes by expressing the intention of determining the behavior of 
water vapor in this respect, with the view of deciding the question 
as to whether or not it exerts a strong absorptive power on the 
heat rays (see preceding notice, and p, 236, March, 1881).—Ann. 
der Phys, u. Chem., Jan. 1881. 
II. GEOLOGY. 
1. International Geological Congress at Bologna.—The second 
meeting of this Congress will be opened on the 26th of September 
mm 
tees, to make reports at Bologna: one on the unification of 
of s of nomenclature of species in mineralogy and paleontol- 
° t ese Committees consists of 
Canada, President; M. Renevier, of Lausanne, Secretary ; and of 
Messrs. Ramsa iversidge, von er, von n, Giimbel, 
von Méller, Torell, Dupont, De ‘Chancourtois, Giordano, Ribeiro 
L members of the second are, 8, 
President ; M. Dewalque, of Liége, Secretary; and Mess 
ughes, Liversidge, Capellini, A. Favre, Remer, Szabo, Ste- 
e 
