416 Screntifie Intelligence. 
structed with lenses of quartz and prisms of Iceland spar. With 
en ] 
i ae beyond N, but with the spectroscope whose construc- 
n he describes in detail the principal lines could be distin- 
at an sage of Ae meters, and draws from them the conclu- 
more refrangible than T. Whence he infers that it is the atmos- 
phere of the sun, and not that of the earth which absorbs the 
most Reirengibla rays of the spectrum. The diminution in bril- 
~ Heat.- aa ‘ Crova has published a very avon de d 
paper on the calorific intensity of the solar radiation and its 
absorption by the atmosphere of the earth. In this paper the 
author discusses very exhaustively methods of observation and 
gives the results of a large number of measurements which are of 
great interest, but can nes nas described in a short abstract.—Ann. 
Chim. et de Phys, xi, By Cy TR 
12. Changes tn the ‘Speatra ‘of Gases caused by increasing ten- 
sion.—In the spectrum of a gas rendered luminous by an electric 
spark M. eee dvi two classes of foc as caused by 
remain meanwhile as definite as at first. In the case of compounds 
of carbon and markedly in the case of carbonic dioxide the bril- 
is. “ The Tnpu ence of Light in Chemical Chances aad dell 
in kee ” is the subject of a recent paper by M. P. Cuas- 
tainc. The author distinguishes as a definite effect of the sun *s 
solar spectrum from the well-known reducin eee le dedu toe 
this conclusion chiefly from the observation that the oxidation of 
