PROCEEDINGS 
OF 
THE ROYAL IRISH ACADEMY. 
1846-7. No. 65. 
April 26th, 1847. 
REV. HUMPHREY LLOYD, D.D., President, in the 
Chair. 
The Rev. Dr. Robinson presented an autograph of Euler. 
Dr. Apjohn drew the attention of the Academy to some 
researches in Thermo-chemistry, with which he has been 
recently occupied. 
A 
had 
a 
*¢ It is well known” (he observed) ‘* to chemists, that muri- 
atic acid gas and ammoniacal gas are absorbed by water in large 
quantity, and that during their absorption much heat is deve- 
loped. The experiments which I have undertaken had for 
object, to submit to exact estimation the heat so evolved ; and 
the results being, as far as my information extends, quite novel, 
and, I think I may add, theoretically and practically interest- 
ing, I am anxious to present them to the public with as little 
delay as possible. 
«‘ The apparatus employed in these experiments, though 
necessarily somewhat complex, proved admirably adapted to 
the purpose to which it was applied. It consisted of a flask, 
in which the gas was developed, of an exsiccation tube, and 
of a pair of tubes of small bore attached to the latter, by one 
VOL. III. 2P 
