life of paint, that is, the thing that makes it wear, is misleading, and has been the cause of most of the blunders and failures with it in the past. An excess of linseed oil in paint is as much an adulteration of paint as the introduction of useless or harmful pigment. We work upon the hypothesis that the solids are coefficient with the liquids in producing the best materials, and that the secret, if there

be any, lies in the proper adjustment or determination of the amount and kind of each needed to secure a perfect product. No amount of theoretical and empirical knowledge can determine questions of this kind. There are to-day many signs, however, that in the struggle for victory men are accepting the logical conclusion from classified facts, their mutual relations and sequences, that properly prepared paint  is  bound  to win out, because it