Glue. 
413 
monly called cat-gut^ and from some trials, promised 
superior advantages when applied to mechanical opera- 
tions. 
Isinglass is also of great use in medicine, and cookery. 
EXPERIMENTS ON GLUE MAKING. 
To the editor of the Tradesman^or Commercial Magazine. 
Sir Berwick^ BthJune^ 1809. 
ON looking over the 7th Number of your Magazine, 
I observe a letter from Perth, with some observations on 
making glue. I am not so perfectly acquainted with the 
process of glue making as to give complete directions to 
any person wishing to embark in that manufactory, but 
making experiments on a variety of substances, which 
seemed likely to be converted into that article, engrossed 
much of my attention for some years. Some of my ex- 
periments may possibly excite a smile from the professed 
chemist, but at the same time I am persuaded that they 
may be of some use to the practical experimentalist, and 
may possibly save a great deal of both time and trouble 
to any who may be inclined to pursue the same object. 
My time would not admit of putting down in writing the 
twentieth part of my experiments, but the result of the 
most conspicuous is perfectly fresh in my memory, 
J learn one useful lesson from your correspondent, 
which is, we should never be too confident, that we have 
collected all and every information which a town, a certain 
district, or journey may procure, however minute our 
observation and enquiries may have been ; I had no idea 
that there was a town or village, either in the north or 
south, but some person knew that all sorts of animals^ 
skins, and every kind of leather, (except such as had re- 
VoLIL ^ SO 
