110 E. LINDON MELLUS 



Owing to imperfections in the material, the relations in the 

 frontal lobes were not^o clear but the number of migrating cells 

 passing in the white matter was quite as great as in other parts 

 of the brain. In addition to this there were numerous masses 

 of nuclei here and there distinctly visible to the naked eye. The 

 nuclei were thickly massed and resembled both the 'Ubergang- 

 schicht' and the streams seen passing from the ventricle in other 

 parts of the brain. 



A portion of the right hemisphere of a new-born child (still- 

 born) shows the same activity in the production of neuroblasts by 

 the germinal cells in the walls of the ventricle. The stratification 

 of the calcarine cortex is more marked than in the eight months 

 brain but the 'Ubergangschicht' surrounding the ventricle in the 

 occipital lobe is still distinct and at some points it consists of 

 two layers separated by a pale layer. From the 'Ubergang- 

 schicht' several quite distinct streams of neuroblasts are directed 

 toward the various convolutions and can be followed as such for 

 some distance. The cells of the calcarine cortex were distinctly 

 more developed in the new-born than in the eight months brain. 

 While in the latter the sohtary cells of Meynert were the only 

 ones with a distinct cell body, in the former a majority of the cells 

 of the calcarine cortex had developed distinct processes. I find 

 it very difficult to arrive at any conclusion in regard to the com- 

 parative depth of the cortex in these two brains without more 

 careful study, but in the new-born brain the cells in the calcarine 

 cortex are certainly more numerous and more closely packed 

 than in the same region in the eight months brain. 



A frontal section through the midbrain just anterior to the 

 temporal pole and passing through the anterior island shows a 

 band of closely packed neuroblasts passing in a broad sweep from 

 the inferior horn of the lateral ventricle beneath the cross-cut 

 bundles of the internal capsule, around the inferior and external 

 margin of the lenticular nucleus, gradually growing narrower and 

 less distinct as it passes upward and outward (fig. 2). This 

 band of neuroblasts is quite easily seen by the naked eye in well 

 stained sections. Outside this band is a broad pale zone follow- 

 ing the same direction and continued upward around the external 



