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Those familiar with psychiatric literature have already, in past years, followed the work of Dr. Bolton as it has appeared from time to time in the Journal of Mental Science. It is a source of gratification that he has accumulated it and now offers it in a single volume. The work is perhaps particularly interesting at this time because it no longer stands alone. Dr. Bolton's study of the cortex by his careful micrometric measurements of the depths of its several layers, correlates his investigations at once with those of Campbell and Brodmann and his findings are comparable to those of these two investigators. In fact he has made this interesting comparison.
Dr. Bolton, however, has not been able, during the past eighteen years which he has devoted to this study, to apply his methods to but a limited portion of the cortex. The areas which he has studied are the visuo-sensory, the visuo-psychic, the prefrontal, and the psychomotor. He takes these various regions up from the point of view of evolution and development, and he believes as a result of his studies that he has been able to demonstrate that the visuo-sensory area is developed earlier