VASCULARITY IN THE NERVOUS SYSTEM 



449 



the Marchi method, concluded that it is probably of only second- 

 ary functional importance in -the rat. Ranson ('13), however, 

 pointed out that King's results were in all likelihood due to the 

 incomplete myelination of the tract, remarking that it was 

 impossible to say how far this incomplete myelination might 

 be indicative of functional insignificance. It is interesting to 



Port* of train 



Chart 3 Graph showing the relation between the results obtained from Tor- 

 onto and from The Wistar Institute animals. Toronto, •; Wistar Institute, +. 

 Numbers of regions as in chart 2. 



To obviate any possible error in the construction of this graph arising from 

 the disproportionate number of the two sexes, the figures for the four Toronto 

 females were added together and divided by two. The quotient was then added 

 to the figures for the two males and the whole divided by four. In this way the 

 proportional value of the sexes became equal in each local group. 



note the relatively high vascularity of this tract, suggesting great 

 activity. 



As six of the animals studied were obtained in Toronto, while 

 the remaining four were from the standard colony of The Wistar 

 Institute, it was thought advisable to group these two sets 

 separately and compare the results. This is done in chart 3, 



