Readers maybe interested in an extract from `The Home Workshop' by
George E Blakelee author of `The Practical Mechanic' etc etc. This must
have been published in the 1910's or 1920's

"Liquid, or Prepared Glue. -There are several formulas for making glue,
but none of them so good for wood as the hot glue, with no addition but
water.  A little nitric acid will prevent the glue from gelatinising or
becoming solid, and the further addition of a little vinegar will
prevent it from moulding.   Some add sulphate or chloride of zinc
to common glue for the purpose of keeping it liquid."

In the UK we call it "Scotch Glue".

On some modern organ organ jobs I have used a glue called M155
bookbinding glue very satisfactorily.  It takes leather very well & will
dissolve with water even more readily that Scotch Glue.

I hope this may be of interest to someone. There are at least 6 more
pages about glues in this book which I will put on here if anybody is
interested ?

Tim Blyth