The Morphology of Fimctional Activity in the Ganglion Gells etc. 549 
differences in rate and degree of its formation and consuraption between 
extremes of cellular differentiation. 
2. Differentiation is a matter of relative quality, not of mode of 
reaction. The evidence from the side of the nature of the nerve cell’s 
reaction with its unity of mechanism is regarded as indicating the ab- 
solute elimination of inherent differences in specific cellular powers as 
not at all demanded in explaining the most diverse nervous function. 
Columbia, Missoiu'i, U. S. A., July 24. 1912. 
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37 
