ONE FIGURE In a previous paper' a method was described by which Wood's metal casts of the ventricles of the brain can easily be made; and in a comparison of casts from five different brains it was observed that wide variations existed between the different casts, and between the two sides of the same cast. It was noted that the linear dimensions of the left anterior horn and body exceeded those of the right side, that the left posterior horn was more extensive in a majority of the casts, and

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... t in the inferior horn the excess in dimensions was in favor of the left side as many times as of the right. Since then other casts of different brains have been made with the idea of obtaining a series for a comparative study of the casts themselves, and of their relations to the brains from which they were obtained. It is the intention in this paper to report the results of volume measurements of ten casts, together with the brain-weights, as a preliminary t o the further study of the ventricles. The method employed in obtaining the casts was slightly modified from that previously described. The brains were hardened in formalin, and after removal from the solution were allowed to drain for five minutes. The weight of each was taken before sectioning. Coronal sections were made through the genu of the corpus callosum, the foramina of Monro, and the splenium of the corpus callosum, thus dividing the brain into four sections. The parts of the ventricles contained in each section were cast sepa-1 Harvey, R. W. A cast of the ventricles of the human brain. Annt. Rec., vol. 4, no. 10, Oct., 1910.