The course of science is from the simple to the complex; and then again, the extension of science depends upon the adoption of the simpler for more intricate and complex tools and methods. Histology and pathology advanced with the perfection of the microscope and then rested until the microtome gave them a new impulse. We hear no longer of microscopists, but of microtomists.
The new impulse which Flemming and Altman have given microtomy depends upon more perfect and successful methods of fixation and staining. These methods have been too difficult and the materials too unstable to permit of their general use. It is, therefore, with satisfaction that we read in the Medical News, of November 19, Ohlmacher's recommendation of the simpler method of Heidenhain.
This method is especially adapted to operators and physicians. The perfectly fresh tissue is cut in cubes no more than three-eighths of an inch square. It