298 



THE GROWTH OF THE BRAIX. 



the difficulty for the organism is the same, in that changes 



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dent variation in several systems, 



are wrought in 

 the central system 

 which cannot be 

 maintained with- 

 out the repetition 

 of the drug. Stim- 

 ulation of the cells 

 forming the body 

 is a normal and 

 necessary process, 

 and what it has 

 been agreed to 

 call food acts as 

 a stimulant, but 

 with the mini- 

 mum damage to 

 the elements. By 

 contrast thegroup 

 of substances 

 which are classed 

 as drugs produce 

 more decided 

 effects and ap- 

 parently do more 

 harm. The real 

 difficulty in pro- 

 perly utilising the 

 rhythms produced 

 by drugs depends 

 on the fact that 

 while the normal 

 rhythms involve 

 a mutually depen- 

 the drugs tend to 



