164 Obituary. 
America had given attention to the spectroscope, and, except 
Fraunhofer, few in Europe 
decomposition in the spectrum itself, I showed that it is effected 
b w. Under very favorable circumstances I exam ed 
the experiments said to prove that light can produce magnetism, 
and found that they had led to an incorrect conclusion. The 
first photographic portrait from the life was made by me... . - 
I also ained the first photograph of the moon. ... - 
obtaining more accurate results in these various inquiries I in- 
vented the chlor-hydrogen photometer, and examined the modifi- 
cations that chlorine undergoes in its allotropic states. Since In 
such researches more delicate thermometers are required than our 
arm; and that, s one portion—the violet—being dis- 
tinguished by producing chemical effects, every ray can accom- 
plish special changes is series of experiments, on radiations, 
ea $ ; . 
is concluded in this volumé by an examination of the chemical 
: hg 
This is a remarkable series of claims for one investigator to oe 
up on a single line of research. But they were well founded; an : 
