ANIMAL AND VEGETABLE 191 



a piece of nerve causes practically no metabolic change or 

 using up of oxygen, therefore the mere conduction of a 

 stimulus along a nerve does not entail loss of neuro- 

 potential. The chemical processes incidental to the 

 using up of nervous energy in the neuron take place in the 

 cell itself, and it is for this reason that the blood supply of 

 the grey matter is six times that of the white matter." 



All this, coming as it does from a great pathologist, is 

 strongly in favour of the opinions I hold. 



