REGENERATION IN PLANTS 91 



idea also fails to explain certain results. Vochting has found, for 

 example, that if an incision is made below a bud and the piece con- 

 taining the bud be lifted up somewhat from the rest of the piece, 

 remaining attached only at its anterior end, the bud will begin to 

 develop. In this case the conditions preclude an accumulation of food 

 substances in the piece, and the bud is even farther removed than at 

 first from the main current, yet it begins to develop. 



We shall find, I think, that the idea of food stuffs fails to explain 

 some of the simplest phenomena, and while it need not be denied 

 that under certain conditions the presence or accumulation of food 

 materials may produce certain definite results, yet such food stuffs 

 seem to play a very subordinate part as compared with certain other 

 internal or innate factors. 



