120 Correspondence of J. Nicklés. 
on the instrument; and he endeavored to prove thereby that the motion 
was due to a play of the muscles. e work of M. Chevreul should 
properly be read and submitted to a commission; but some members 
of the Academy have objected to the consideration of a subject cot 
nected to such an extent with superstition. M. Chevreul believes that 
pages. The first article is entitled ‘The History of my Youth.” It 
is in fact a romance, in whic are-interwoven the adventures of Arago in 
Spain, and also piquant details relating to many of the principal sciem 
The volume is preceded by an introduction by M. Alexander vo" 
Humboldt, whose friendship for Arago dates back nearly half a century: 
Poisonous effects of Carbonic Oxyd.—At the World’s Fair at Lot 
don, there were exhibited certain samples of iron and steel, of ae 
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