Abstract
The routine use of the supravital technic in the diagnosis of intracranial tumors has led to greater proficiency in differentiating lesions at the time of operation, and the surgeon has come to depend more and more on its aid. During the period of about four years since the adoption of the method in Dr. Cushing's clinic, increased familiarity with the true microscopic appearances of the various forms of growth has gradually been acquired. The principles of the technic have already been described.1A number of cases reported in more or less detail may best serve to illustrate the further progress made. The following have been selected because of their possible interest, not only to the surgeon, particularly in those instances in which an immediate histologic diagnosis was essential to the conduct of the operation, but to the pathologist because of the peculiar and enlightening appearances of the tumors in

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