the intelligence and good will of the painter than upon the quality of the material used.

It is worthy of mention that, in all the years the company, with which the author has been connected, has been making tests of oil paints upon roofs, bridges, and test-plates of wood, iron, steel, and glass, we have never had the paint blister, scale, or peel off, although, of course, results have often been non-concordant and we have noted great difference in durability, covering, working, and drying properties. Why? Because each coat has been applied by an expert painter with thought and care, to a surface in fit condition to receive it, and the paint was, in each instance, protected when drying.

Physical Tests.—By this is meant weather tests or the exposure of the dried paint, on metallic   or   other   surfaces,   to   the  destruc-