140 Journal of Comparative Neurology, 



summary will show a few minor discrepancies between them in the numbers 

 given for the thickness of some layers, and the size of some cells. In defense 

 of the data which appear in these tables, it is only fair to state that where dis- 

 crepancies occur, they are due to errors in KSlliker's transcription of Hammar- 

 berg's numbers. The list of these misprints is as follows : 



Thickness of layers. Kolliker. Hammarberg. 



Region I, layer 4 0.7 0.2 



Region I, layer 6 0.89 0.8 



Region 3, layer 4 0.3 0.2 



Size of cells. 



Region 7, layer 4, 6-8x«o 6x8-10 



Region 15, layer 6, 12-30X40 12x30-40 



In region 5 layer 3, Kolliker assumes a thickness of o. i where Hammar- 

 berg does not give the number and Table VII assumes 0.3 as the thickness. 



