=Test No. 6.= Concrete primed with a 10% mixture of acid calcium phosphate, followed with two coats of No. 119 blue. The acid phosphate solution evidently had a neutralizing effect upon the lime in the concrete, as the paint is in fair condition. =Test No. 7.= Concrete primed with one coat of a soap emulsion of the following composition, then painted with two coats of No. 119 blue. Water 85% Linseed oil 12% Alkali 3% Very poor results obtained. Destruction of color and peeling resulted. =Test No. 8.= Concrete primed with one coat of white paint of the following composition: PRIMER Zinc oxide 25% Silica 35% Corroded white lead 20% Gypsum 15% Whiting, etc. 5% Ground in a vehicle of linseed oil and containing 35% of volatile hydrocarbon spirits and drier. This coat was followed by one of the following composition, tinted blue: Zinc oxide 60% Gypsum 20% Silica 20% Ground in linseed oil with 12% of turpentine and drier. Fair results shown during first year, but a breakdown occurred during the second year, and cracking and scaling resulted. =Test No. 9.= This test was a duplicate of No. 8 with the addition of 5% of zinc sulphate solution emulsified into the primer. Slightly superior to Test No. 8. =Test No. 10.= Primed with a white paste paint thinned with turpentine. Second coated with same paint tinted blue. FORMULA OF PASTE Zinc oxide 40% Whiting 30% Silica 20% Alumina and gypsum 10% Ground in 16% of linseed oil vehicle. Scaling and peeling due to lack of binder and use of saponifiable oil resulted during the first six months' exposure. Entire destruction of coating at end of two years. =Test No. 11.= Primed with a white mixture, and second coated with the same mixture tinted blue. FORMULA OF MIXTURE Whiting 30% Silica 30% Zinc oxide 40% Stirred into a 5% solution of glue in water, until a fairly thick paste was obtained. Much chalking was shown, and a bleaching of color. It is evident that this mixture would not serve to keep moisture out. =Test No. 12 A.= Primed with a 5% solution of soluble nitrated cotton and paraffin dissolved in equal parts of amyl acetate and benzine. Second coated with No. 119 blue. Not very good results were obtained, chalking and slight scaling resulting. =Test No. 12 B.= Primed with a heavy varnish containing Chinese wood oil and kauri gum. Second coated with No. 119 blue. Fair results obtained. =Tests Nos. 13, 14, 15, and 16.= Primed with a solution made by dissolving 10 parts of sodium oxalate in 100 parts of water. Second and third coated with linseed oil paints in red, brown, blue, and green. Very good results shown at end of test.