_THE PHYSICAL CHEMISTRY OF THE HIDE-FIBRE._
Causes of swelling and contraction -- The essentials of the tanning
process -- The constitution of matter -- The nature of molecules --
Vapour-pressure -- Surface-tension -- Solution-pressures -- Jellies --
Crystals -- Osmotic pressure -- Electrolytic dissociation --
Electrolysis -- Reactions of ions -- Absorption of water by gelatine
-- Dehydration by alcohol -- Action of acids, alkalies and salts on
gelatinous fibre -- Physical explanation of swelling -- Action of
acids on gelatine -- Action of alkalies on gelatine -- Effect of salt
-- The pickling process PAGE 73