Mr. H. Percy read a paper on “The Intensification of Negatives,” giving general directions for improving the printing qualities of thin and over-exposed negatives. Many negatives, through errors in exposure and development, fail to give satisfactory prints unless some means are adopted to increase the contrast which such negatives yield when printed from. The increase in contract is furnished by a negative when intensified. The methods of accomplishing this were given, and results shown before and after intensification, the marked improvements in the latter being very evident.