616 E. H. J. SCHUSTEK. 



described, but tliat of the fibres also. The huiiiau brain is 

 compared with that of the two apes, and the clinical, patho- 

 loo-ical, and expeiiinental evidence is fully discussed in its 

 relation with the histological results. 



An excellent series of papers on the cell latnination have 

 been published by Brodniann in the 'Journal f. Psychologie 

 land Neurology,' 1903 and onward, and summarised in his 

 book, ' Vergleicheude Lokalisations lehre der Grosshinirinde,' 

 Leipsig, 1909. The human brain is desctibed in great detail, 

 a very large number of separate ai-eas (more than fifty) being 

 distinguished histologically. Similar detailed descriptions of 

 the brains of Cercopithecus and of the lemurs ai'e given, while 

 the marmoset (Hapale) is dealt with more shortly. The homo- 

 loo"ies between different regions in the human and other 

 Primate brains are dealt with as far as possible. 



Mott and Kelley publish a, •"' Complete Survey of the Cell 

 Lamination of the Cerebral Cortex of the Lemur" (' Proceed- 

 ings of the Royal Society,' B., vol. Ixxx, 1908), in which the 

 histological results are compared with the results of stimula- 

 tion expei'iments pierfoi-med on the lemur's brain by I'rof. 

 Halliburton, and a paper of a similar nature, but dealing with 

 the brain of the marmoset, has been produced by Mott, 

 Halliburton, and the present author (Mott, Schustei-, and 

 Halliburton, "Cortical Lamination and Localisation in the 

 Brain of the Marmoset,'^ 'Proceedings of the Royal Society,' 

 B., vol. Ixxxii, 1910). 



Material and Methods. 



The material used in the present paper consisted of the 

 brain of a specimen of Papio hamadryas which had died 

 in the gardens of the Zoological Society. 



Each hemisphere was cut into a number of blocks (seventy 

 or more), arranged in such a way as best to secure that as 

 much as possible of the cortex was cut in planes at i-ight 

 angles to its surface, since in oblique sections the nature of 

 the cell lamination is almost impossible 1o determine. The 



