Since it is always a good practice to take an inventory of the progress of one's art, this rather modest volume deserves attention. The author limits himself principally, though not entirely, to the advances made in England and in America. Because of limitation of space and multiplicity of subjects he adopts a selective method, avoids much that is known, and points out the more recent ideas and practices. The best written chapter is that on neurosurgery. It contains a discussion of the circulation of the cerebrospinal fluid, of hydrocephalus, of recent work on the pathology of tumors of the central nervous system, and of newer diagnostic methods, such as examinations of cerebrospinal fluid, cisternal puncture, ventriculography and pneumomyelography. Other chapters give the impression of being somewhat inadequate, perhaps because of space limitation.