"=Some Peculiar Conditions Affecting the Tests.= The inspectors were most impressed during the inspection by the blackness exhibited to such a high degree by certain panels, and the fair degree of whiteness by others. It is well known that in Pittsburg nearly all paints become darkened by the deposition on their surface of carbon particles emanating from the combustion of soft coal. Certain of the paints, however, presented fairly white surfaces, and it would thus appear that the extreme darkness shown by other paints was due to their composition. Corroded white lead when used alone was uniformly covered by black particles, and the higher the percentage of corroded white lead in a paint the darker was the surface. It was at first thought that this darkness was due to the softness of the white lead pigment or to its roughened surface, in causing adherence of soot particles. Sublimed white lead, however, which is also a soft pigment, chalked even more progressively than corroded white lead, but its surface was not rough, and presented a very white appearance. Scrapings from the different panels are being taken, and after a careful analysis the findings from the investigations will be reported by a member of the Inspection Committee." A. C. RAPP. _Chairman Test Fence Committee, Pittsburg Branch, Master Painters' Association_ JOHN DEWAR. _Member Fence Committee, Pittsburg Branch, Penna. State Association of Master Painters_ J. H. JAMES. _Chairman Carnegie Technical Schools' Fence Committee_ J. A. SCHAEFFER. _Instructor in Chemical Practice, Carnegie Technical Schools Pittsburg, Pa._ H. A. GARDNER. _Director Scientific Section, Paint Mfrs. Asso. of U. S._ _May 31, 1910_ PITTSBURG TEST FENCE COMPARATIVE SPREADING RATES OF WHITE PAINT ON WHITE PINE PANELS _Average Spreading Rate 266 Square Feet_