I02 



THE GERjNI-PLASM 



Let us now return to the question of regeneration. If each 

 cell in the fully-formed bone only contains that kind of idioplasm 

 which controls it, and which is therefore the molecular expres- 

 sion of its own particular nature, it would be impossible to 

 understand how the regeneration of the bone could be effected — 

 when, for instance, it had been cut through longitudinally. 



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Fig. 3. — Diagram of the Cell-Generations in the Fore-Limb of a Triton. 



Supposing that a stimulus, produced by the injury, caused the 

 cells of the injured part to undergo multiplication : bony tissue 

 would then, indeed, be developed, but a bone of a definite shape 

 and size would not necessarily be formed. The formation of a 

 definite bone can only take place if the proliferating cells possess, 

 in addition to their active determinants, a supply of determinants 



