. The brain as an organ of mind. be definitely decided for the present. It is obvious that very great care is needed in making the sections through the ^ cerebral peduncles and corpus callosum, preparatory to such comparative weighings of the two Cerebral Hemispheres, and also that the weighings themselves require to be made with the greatest care. (5.) The writer manyyears ago ascertainedthat the specific gravityof the Grey Matterfrom the frontal parietaland occipital Convolu-tions, respectively, is ^jg^ 14s.—Posterior Diagrammatic View ofoften sliohtlv hiher on ^ura Mater with Great V^enousS
. The brain as an organ of mind. be definitely decided for the present. It is obvious that very great care is needed in making the sections through the ^ cerebral peduncles and corpus callosum, preparatory to such comparative weighings of the two Cerebral Hemispheres, and also that the weighings themselves require to be made with the greatest care. (5.) The writer manyyears ago ascertainedthat the specific gravityof the Grey Matterfrom the frontal parietaland occipital Convolu-tions, respectively, is ^jg^ 14s.—Posterior Diagrammatic View ofoften sliohtlv hiher on ^ura Mater with Great V^enousSimises. (Todd.)- The posterior portion of the Cranium and the the left than it is onthe right Hemisphere,though such superiordensity does not neces-sarily exist in each of these regions in t]ie same indivi-dual.* This unexpected result frequently, though notinvariably, showed itself, even where every care was takento get rid of sources of fallacy. Further observations are,* See Journal of Mental Science, January, 1866, p. IJosterior arches of the upper spinal Vertebrae aresvipposed to be removed, s, The longitudinalsinus ; t, the torcular Herophili, where longi-tudinal and occipital sinuses meet, and whencethe lateral sinuses (e) diverge. 404 THE EXTERNAL CONFIGURATION however, also needed in regard to this subject, and otherconvokitions than those above named should be similarlytested.* The Cerebellum and its Lobes. The Cerebehum or little Brain, in the erect posi-tion of the body, is situated behind and above the ponsand Medulla (fig. 132), and lies in a posterior hollow of theskull beneath the Occipital Lobes, from which it is sepa-rated merely by a membranous partition. This membrane,named the tentorium, is an internal horizontal prolonga-tion from the dura mater; the Occipital Lobes lie on itabove, while the uj)per surface of the Cerebellum is incontact with it below. The relative weight of the Cerebellum as comparedwith the Cerebrum has already been referred to, a
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