CHAPTER I.

NATURE of GLUE.

PAGE

Sources of glue; Change in the animal tissues by continued boiling; Definition of what is known as glue; Most important glue-yielding substances 1

Transformations of which glue and gelatine are the products; Transition stages of glue; Production of the glue-yielding substance of the animal body 2

Crude glue and jelly; Constitution of glue; Combinations of which glue consists 3

Preparation of pure glutin; Properties of glutin 4

Preparation and properties of chondrin 5

Adhesive power of glutin and of chondrin; Properties of glue and its behavior towards other substances; Quantity of glutin in glue 6

Properties of jelly before drying to glue; Absorption of ozone by the jelly; Behavior of glue solution towards different salts; Effect of acids upon glue; Meta-gelatin 7

Combinations of tannin with the jelly; Effects of dry heat upon glue; Chemical composition of glue and glue-yielding substance 8