Journal of the Academy of Natural Sciences of Philadelphia . e readily distinguished as a whole, Plate XLIII, figs. 1 and 2. Inthe Mongolian, so far as can be determined from a single specimen, Plate XLI,figs. 3 and 4. it presents quite as tortuous and complicated an appearance asfound in the Caucasian. The brain of the negro, Plate XLII, fig. 1, illustrates another very interestingfact in this connection. In this brain the interparietal fissure temiinatesdirectlyin the Sylvian at its upper extremity, so that in this brain the lobule du pit mar-ginal (supra-marginal lobule) which Gratiolet ass
Journal of the Academy of Natural Sciences of Philadelphia . e readily distinguished as a whole, Plate XLIII, figs. 1 and 2. Inthe Mongolian, so far as can be determined from a single specimen, Plate XLI,figs. 3 and 4. it presents quite as tortuous and complicated an appearance asfound in the Caucasian. The brain of the negro, Plate XLII, fig. 1, illustrates another very interestingfact in this connection. In this brain the interparietal fissure temiinatesdirectlyin the Sylvian at its upper extremity, so that in this brain the lobule du pit mar-ginal (supra-marginal lobule) which Gratiolet asserted, and other writers haverepeated, was characteristic of the human brain as distinguished from the Simianbrain, is entirely absent on the surface, the slightest trace of its presence beingindicated by the very small fold, P2, which lies entirely concealed within the inter-parietal fissure in its natural condition. I have slightly widened this fissure bypushing aside its two borders in order to bring this concealed fold into view. This Fig. 13. Fig. Man. Lemur. is a very interesting specimen, since it shows that we cannot make any absolute dis-tinction between the simian and human brain. In the brain of the negro, PlateXLI, fig. 1, this concealed fold has come to the surface, but exists as a simple smallquadrangular lobule, P2. In the brain of the mulatto, Plate XLIV, fig. 1, it willbe found well developed, assuming the character found in the white brain. In theChimpanzee, Plate XXXIX, fig. 4, P2, it is also well developed. Here, then, canbe traced a perfect series as regards the development of this supra-marginal lobule,from the monkeys, through the Anthropomorpha, thence to the brain of the negroby intermediate steps to the condition as found in the brain of the Caucasian believe that an attentive study of a large number of negro brains will clear upmany points in respect to the comparison of the human and anthropoid brains. Ihave especially found such comparis
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