Mr. M.H. Stiles read a paper on “Photo-micrography,” illustrated by the apparatus used in photographing microscopic objects and bt specimens of the work done with it. The convenience and absolute fidelity of this method of delineation were pointed out, and as in other departments of science, it was rapidly becoming the most trustworthy method of recording results of work. In this branch of microscopy considerable improvements had taken place of late years, owing to the adoption of colour-sensitive plates and more carefully corrected lenses. Mr. Stiles, after describing the apparatus and the source of light, gave an account of the manner in which the necessary adjustments should be made in order to produce good results. In doing this great care is required, and special emphasis was laid on the importance of attention to details. The powers used by the lecturer had ranged from 4-inch to 1/12 inch oil immersion, and specimens of work produced with each power were exhibited and were much admired by the audience.