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THE variation in the thickness of the human skull in different individuals, and in different parts of the same skull, is well known. The causes of these varieties have been assigned to the character of the soft parts, the changing character of the brain, and are, in a great measure, due to the same causes that regulate the growth and development of the individual. The following observations were in 154 skulls of subjects brought to the anatomical rooms. The measurements were made with callipers carefully adjusted, and in the following regions :-A. The superior angle of the frontal in the superior longitudinal sinus. B. Above the external angular process. C. Parietal eminence. D. The anterior superior angle of the parietal outside the longitudinal sinus and the Pacchionian depressions. E. The posterior superior angle of the parietal. F. Posterior inferior angle of the parietal in the lateral sinus. G. In the middle fossa, near the centre of the squamous part of the temporal bone. H. Occipital (superior angle) in the lon~tudinal sinus. I. Occipital at the middle of the inferior foss~e. J. Occipital protuberance. K. Occipital superior foss~e. L. Frontal eminence. M. Weight of brain. Where two measurements are given, connected by a hyphen, the first indicates the size of the right, the second that of the left. The numbers indicate sixty-fourths of an inch. Thus, in ~o. 1, the thickness of the frontal near the superior angle is 1 s _ v~_ 88 inch. The column immediately succeeding M contains the nature of the convolution markings. These are usually best marked at the base. For the greater number they were slight or absent at the roof. a. Convolution markings slight. ft. No eonvolution markings, % Convolution markings distinct over lower parietal part.

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