of use, it still holds its own as the best oil for painters' use where durability and drying are the main considerations.

Linseed oil in drying changes from a liquid, first into a sort of jelly of a colloidal nature, with a tendency to catch and retain air bubbles, and then to a solid rubber-like substance, which not only holds itself together, but also clings to any dry substance upon which it is formed. Linseed oil in drying takes something from the air, namely, oxygen, and gives off something to the air, namely, carbon-dioxide and water. Mulder beautifully describes the process and calls it "the breathing of the drying oils." In his book, "Die Chemie der austrocknenden Oele," he named the solid, rubber-like substance into which a layer of linseed oil finally hardens, "linoxyn." Linoxyn is a solid, not   a   liquid.   It   is  insoluble   in   many