PROCEEDINGS 



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. 



" 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. 2 P 



