112 Scientific Intelligence. 
the heat of absorption is oe stil than ok - of solidification, the 
former being 148°8 and the latter 1388-7 u 
(4.) In the case of certain sisi the sum ng the heat i 
for the same weights of gas absorbed, is the same, whatever be the 
nature of the carbon, which in this case only affects the rales of the 
gas fixed in its pores. This result taken in connection with the others 
seems to shew that the thermic effect is not due to the liquefaction of 
the gas, but to some §pecial action, since the introduction of a smal 
calls capillary affinity—Comptes Rendus, xxxix, 929, Oct. 16, 1854. 
. Researches on the Paige =. Vamemeiee has studied the action 
which acids when confined in close vessels exert u upon the compound 
(ls ). Some of the compound ethers by means of hydric ether 
and a 
(2.) es formation of the ethers by means of alcohol and acids. 
(3) Decomposition. of the ethers under the influence of water and 
yor" 
Whew ether and different acids are heated — in strong 
08 te toa opens of from 360° to 400° C., water is set free 
andac und ether is formed. In this manner the eal produced 
“iy alii butyric and chlorhydric ether. When ether, butyric 
and sulphuric acids are distilled together, butyric ether is formed in 
ablations while at the same time olefiant gas is generated. Acetic 
ether was formed by a precisely similar process. 2. When alcohol is 
heated in closed tubes with the fatty acids, which as is well known are 
the feeblest of the organic acids, the corresponding ethers are readily 
produced, although the combination is never total. In the presence of 
a strong acid, however, the combination is most abundant. At 100° 
enzoic, acetic and butyric ethers. Stearic ether was formed in very 
small quantity at the end of two hours, but when acetic acid was added 
combination, whatever be the respective and reciprocal excess of the 
reacting bodies. Berthelot aN i this with great probability to the 
decomposing action exerted on the ethers by the water set at liberty in 
decomposition itself, the intensity of the action being augmented by 
the presence of acids. Thus water heated to 100° during 102 hours 
with stearic and oleic ethers pine to decompose them, regenerating 
stearic and oleic acids. 1 240° a nd ao: some hours of contact, water 
