Paint Coating, Adhesive power of, 104 Elasticity and Strength of, 102 imperviousness of, 100 decomposition of, 122 films, action of water upon, 223 permeability of, 71 Testing machine, 74 preparation of, 70 in Hospitals, 254 making, Laws of, 93 Perry's Principles of, 100 pigments, 42-69 pigments, properties of, 42 preparation for microscopic examination of, 86 tests at North Dakota Experiment Station, 105 at Washington, 207-213 supervisors of, 113 woods used on, 124, 135 Painting steel plates for tests, 230 Paints for cement and concrete surfaces, 214 composition of in steel test, 233 hiding power of, 111 sanitary value of, 252 Panels for laboratory tests, 149 Para Red formula for concrete wall, 217 Paranitraniline paints in Pittsburg tests, 140 Paranitraniline Red, 64 Perilla Oil, 21 Perry's analogies of paint and concrete manufacture, 99 principles of Paint Making, 100 Petroleum Spirits, 20 Photomicrographs, 89, 165 Pigment contention, the, 105 grinding, 87 Pigments, 42-69 as stimulators of rust, 223 Chemical action of upon Linseed Oil, table, 91 Effects of on Oil, 90 inert, use of, 99 moisture experiments with, table, 83 percentages of Oil required for grinding, 68 re-enforcing, 89 report of results of steel paint tests, 236-251 Water resistance of, 81