PROCEEDINGS 
OP 
THE LITERARY AND PHILOSOPHICAL 
SOCIETY. 
Ordinary Meeting, October 5th, 1875. 
Edward Schunck, Ph.D., F.R.S., &c., President, in the 
Chair. 
Mr. Thomas Mackereth, F.RA.S., F.M.S., was elected an 
Ordinary Member of the Society, 
“Glue Batb y,” by Dr. J. P. Joule, F.P.S., &c. 
If su' ihate of zinc or sulphate of copper be dissolved in 
solution of gelatine and then carefully dried, an elastic solid 
is produced holding the salt in combination, which softens 
on the application of heat. I have taken advantage of this 
circumstance to form a voltaic couple which illustrates Fara» 
day’s discovery of the necessity of liquefaction for electro- 
lysis, and which also may not be without some practical 
advantages. 
I paint pieces of zinc with glue impregnated with salt of 
zinc, and pieces of copper with glue charged with sulphate 
of copper, dry, and lay them together in series. The pile 
thus formed is inert when cold, but capable of giving a good 
current when heated, as will be seen from the following 
results obtained with a single couple in connexion with a 
delicate galvanometer : 
Proceedings — Lit. & Phil. Soc.— Y oi. XY.—No. 1. — Session 1875-6. 
