194 
Mr. Faraday on the condensation of 
acid, cyanogen, and ammonia. But besides the analogy 
which exists between the latter and the former, it may also 
be observed in favour of their dryness, that any diminution 
of temperature causes the deposition of a fluid from the at- 
mosphere, precisely like that previously obtained ; and there 
is no reason for supposing that these various atmospheres, 
remaining as they do in contact with concentrated sulphuric 
acid, are not as dry as atmospheres of the same kind would 
be over sulphuric acid at common pressure. 
Euchlorine. 
Fluid euchlorine was obtained by inclosing chlorate of 
potash and sulphuric acid in a tube, and leaving them to act 
on each other for 24 hours. In that time there had been 
much action, the mixture was of a dark reddish brown, and 
the atmosphere of a bright yellow colour. The mixture 
was then heated up to ioo°, and the unoccupied end of the 
tube cooled to o° ; by degrees the mixture lost its dark co- 
lour, and a very fluid ethereal looking substance condensed. 
It was not miscible with a small portion of the sulphuric 
acid which lay beneath it ; but when returned on to the mass 
of salt and acid, it was gradually absorbed, rendering the 
mixture of a much deeper colour even than itself. 
Euchlorine thus obtained is a very fluid transparent sub- 
stance, of a deep yellow colour. A tube containing a por- 
tion of it in the clean end, was opened at the opposite ex- 
tremity ; there was a rush of euchlorine vapour, but the salt 
plugged up the aperture: whilst clearing this away, the 
whole tube burst with a violent explosion, except the small 
end in a cloth in my hand, where the euchlorine previously 
lay, but the fluid had all disappeared. 
