Elaine from Oils. — Soap. 189 
22. Compresstbility of Water.—This experiment has been 
tried by the distinguished Danish philosopher Cérsted, by 
an ingenious apparatus of his own invention. The result 
is thus stated. ‘‘ Agreeably to the mean of a great number 
of experiments, a pressure equal to that of the atmosphere 
iran es in water, a diminution of volume of 0.000045, 
a aft the trials with my apparatus, from the pressure of 4 
a of Mr. Perkins, made with several hundred 
mospheres, give 0.060048 for each atmosphere. I am 
also to taken into consideration, vi water seems 
to lose a little of its compressibility a several compres- 
sions. are not, however, aver this to be the fact, not 
having subjected it to a rigorous trial. arly em. 
23. New process for obtaining Elaine from Oils, by M. 
PecLet.—This process is founded on the property which 
; ‘ 
from the excess of alcaline solution. I hav always suc- 
ceeded in this process with all the oils, decept with those 
that are rancid or have become changed by heat. The 
elaine obtained by this process is partoctly 44 identical _ 
a procured by the bhiicone? s of Chevreul and 
—An. de Chimie, Mars 1 
* 
24. Soap.—M. Chevreul, in a memoir on the causes of the 
difference which is observable in soap, with respect to its 
degrees of hardness and softness, and its odour, arrives at 
the following conclusions : 
