Anatomy. — "Tke auditory and visual cortex in the brains o f two 

 Madurese. By Mr. C. van Noort. (Communicated by 

 Prof. J. Bo eke). 



(Communicated in the meeting of May 26, 1917). 



In the collection of brains, brought home from the Dutch East 

 Indies by Piof. J. Bokke, there were two sets, belonging to inhabi- 

 tants of the isle of Madura near Java. These brains were kindly 

 put at my disposal for the following investigations. The material 

 was used for studying the cortical cell-lamination of some regions. 

 Particular attention was paid to deviations from what we know 

 about the cortical ccU-lamination of the human brain. These latter 

 have, for convenience' sake, been collectively named European 

 brains, since it was impossible to give a nearer indication about their 

 racial origin. 



Brodm Ann's fundamental work on cortical cell-lamination has been 

 my guide. In indicating cortical layers and in naming conical areas 

 I have followed his nomenclature. 



Material and method. 



The braius were distinguished as A and B. Cerebrum A is that 

 of a Madurese, deceased at 36 ; B of a Madurese, deceased at 38. 

 Both were preserved in formalin. 



For studying the auditory cortex 1 made serial sections of this 

 region after embedding in paraffin. At regular distances of 0,5 mm 

 a section of 10 ft thickness was stained with cresyl-violet and 

 examined. In this way besides the structure also the extent of the 

 various cortical areas could be very accurately determined. 



The extent of the visual cortex was always sufficiently clearly 

 demarcated macroscopically by Gennari's line. 



For comparison it was necessary also to study the cortical cell- 

 lamination of these cortical areas in the European brain. 



For this purpose I made a series of the HESCHL-convolution of 

 a European brain. Moreover Dr. Droogleever Fortuyn gave me a 

 series of the whole auditory cortex for comparison. I also had the 

 literature at my disposal. 



The two cortical regions were separately studied one after the 

 other. I began with the auditory cortex and examined : 



