=Vehicles Used and Reasons for Avoidance of Japan Driers.= The pigments used were selected with the view to securing as nearly as possible purity and strength, and as already noted, were out of the same lots used in making the preliminary laboratory tests on inhibitives. They were ground in a vehicle composed of two parts of raw linseed oil and one part of pure boiled oil. Paint is generally caused to dry rapidly by the use of japan or driers. These materials contain a large amount of metallic oxides which might have some effect in either exciting or retarding corrosion. To prevent the introduction of such a factor, these materials were not used in the test. The boiled oil, with its small percentages of metallic oxides, was sufficient, however, to cause the paints to dry in a short time after they were spread. =Testing Effect of Various Prime Coats.= Some of the special tests made included a series of plates prime-coated with different inhibitive pigments, and these tests were designed to determine which pigments offer the best results for such work. These plates were all second-coated with the same paint. It is the opinion of the authors that any good excluding paint may be used whether it be inhibitive in action or not, provided the contact coat is inhibitive. If, however, both coats can be designed so as to have the maximum possible value from both these points of view, the best results would, of course, accrue. The only way such data can be obtained is by careful observation of the results of exposure tests. =Combination Formulas Tested.= By selecting a series of pigments which in the water tests showed inhibitive tendencies, and properly combining these pigments into a paint, it was thought possible that a more or less inhibitive paint would be produced. If this proved to be the case, it would follow that the selection and introduction into a paint of the stimulative pigments would inevitably produce a paint unfit for use on iron or steel. =Data on Application of Paints.= The recorded data on the application of the paint to the panels is voluminous. There is presented herewith, however, the data on two of the paints. NO. 2, QUICK PROCESS WHITE LEAD: Sp. Gr. of pigment 6.78 Lbs. to gallon oil 20.34 Sp. Gr. of paint as received 2.47 Wt. of paint per gallon 20.56 Grams to panel 62 Condition of paint Good Working properties Works easy Drying 24 hrs. all coats 1 coat Oct. 26 T 60 B 29.94 W. fair 2 coat Nov. 3 T 54 B 30.23 W. clear 3 coat Nov. 7 T 52 B 29.66 W. cloudy NO. 9, ORANGE MINERAL (AMERICAN):