THE PROTOPLASMIC THEORY BEFORE 1860. 39 



ism." This has been most fully admitted by Huxley 

 in the foregoing extracts, and he plainly states that 

 the truly vital functions of growth and differentiation 

 reside in all parts of the typical cell and their deriva- 

 tions. And this is indeed still held by the majority, 

 although Huxley's mode of statement in the above 

 review will hardly be accepted now, and his own 

 opinions have undergone considerable change. 



