By a simple procedure to be described it is possible to obtain preparations of the brain in which the contrast between the white and the gray matter is sharp, with the coloring brilliant and the effect lasting. Specimens so prepared are suitable for use in classes and for display in museums (fig. 1). The technic may be extended to lesions of the brain (figs. 2 and 3).
While preparing sections of the brain for the museum, I endeavored to repeat the experiments with cobalt, lead and antimony stains described and vividly depicted in an article by Blair.1 As Blair pointed out, these stains, though not producing a permanent effect, give a good color contrast while the reaction lasts. Sections prepared by me according to this method faded in the course of a few days. Similarly the prussian blue stain, as applied by Sincke2 and Mainland,3 employing ferric