322 Proceedings of the Royal Society of Edinburgh . 
cork in the wall of the vessel 0 ; it is formed of two pieces, whicli 
can be disconnected at L, so as to allow of the removal of the 
calorimeter from the jacket. The calorimeter A is to be filled with 
ice and water, both free from air; the tubes EE and EE supply 
the gases (previously cooled to 0° 0.) necessary for the chemical 
operation taking place in the laboratory B ; while GrGr removes the 
products of combustion, those which condense collecting in H. 
The vessels J and K contain mercury, and it is obvious that the 
quantity of mercury transferred from the one to the other is the 
measure of the thermal, change accompanying the chemical action. 
The space between the calorimeter and the jacket C is filled with 
melting ice. 
The following Gentleman was elected a Fellow of the 
Society : — 
Rev. Thomas Lindsay, M.A. 
* ! / 
