This monograph represents a thorough study of 105 intracranial tumors, seventy-five of which were verified microscopically on operation or at necropsy. Of the remaining thirty, twelve were classed as suggestive of tumor and eighteen as unverified. This classification of his material illustrates the influence of Cushing on Olivecrona's clinic, and it is obvious throughout the entire work. Perhaps in no other field or surgery has the United States exerted such a commanding influence. The work adds nothing new to our ideas of neurologic surgery. It is unfortunate that it does not include an attempt to correlate clinical and pathologic pictures because the future progress in neurologic surgery certainly lies in that direction. It is without any doubt the most thorough report on a clinical study of intracranial tumors that has come from a continental surgeon and speaks volumes for the ideals and ambitions of the author.