488 
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Complete Survey of the Cell Lamination of the Cerebral Cortex 
of the Lemur.* fae 
By Dr. F. W. Mort, M.D., F.R.S., and Acnges M. KELLEY. 
(Received March 6,—Read April 2, 1908.) 
(From the Pathological Laboratory of the London County Asylums, Claybury.) 
[Puates 14—18.] 
CONTENTS. 
PAGE 
I.—Notes on, Material-and Method ~.si...5..52.03c:4.000 20050000622 eeseeeeeeeeee 488 
II.—A Short Account of the Lemur and Correlation of its Mode of Life 
and Habits with the Cortical Development of the Brain............ 489 
i}:-—General Description of the Brain, ..2...21./:40.-sscn.sceseeeecasssesee ses neers 491 
IV.+Histological Description of the Cortex :— 
SUMMA Y=. oteseeisenaees snes Noes Novtiade nee Samet wont een eee eee ane eee REE 494 
(a) Motor Ame as cc sitic hee, donneiesasek esas oie sa ee aah oun eee ee 495 
(6). romtal Area a... 328 225 cig evi es ccswedssedaus ronieee ons aseae en mentee 497 
(c) Post-contral Amen. Sirccetesicasaeutenles diesaaaeucne ten ct cee uer CREE Eee 498 
(ad) Temporal Areas orci e tet sande sas vo ueve sv eccuses saeee mene cone tere 499 
(@) Visual reals eins cae ean se eer cease ov ht ond eases Sieuceeies 500 
(f) ‘Archipallinim:: Reviancomcscoosenc ats m isos see ceesse me odtee tees acemee 501 
Addend ww <ciss0 sehcecceebathecses tur esoeemeee eee Meta Seen esate sence ene ee eee 505 
I. NoTES ON MATERIAL AND METHOD. 
It has been endeavoured by a microscopical examination of series of 
sections of the cerebral cortex of the lemur to map out the extent and 
boundaries of the types of cell lamination observed. The brains of four 
lemurs were used:—One Lemur brunneus, one Lemur mongoz, and two 
specimens of Lemur catta. 
The tissue was divided into small blocks about 3 inches thick, cut as far 
as possible at right angles to the main fissures. Two hemispheres were cut 
up completely, each into about 24 blocks, and the others were used to 
supplement these. To ensure greater accuracy in the results, the blocks 
were cut out in varying positions from the different hemispheres, so that 
any discrepancy in one set of sections might be checked in another. The 
positions from which these blocks were taken were mapped out on 
drawings of the surface of the brain, both the blocks and the key being 
numbered. 
* A Government Grant of £20 was made to defray the expenses of this research. 
