206 C. M. CHILD 



rate of reaction in the organism. For any two rates of reaction it 

 is possible to find a concentration of the reagent in which the 

 resistances will be approximately the same. In order to avoid 

 misleading results it is necessary to be certain that with the direct 

 method the concentration is sufficiently high and with the indirect 

 method, sufficiently low. 



6. These two methods, and especially the direct method, afford 

 a means of attacking various problems and they serve particu- 

 larly to give us some insight into the dynamics of morphogenesis. 



November, 1912. 



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