444 EFFECT OF TEMPERATURE UPON FACET NUMBER 



reaction such as that which determines facet number is proportional 

 to the rate of general metaboKsm. 



In the first part of this study we noted a correlation between facet 

 number and length of the immature stage when the latter was com- 

 pleted at a single temperature. Subsequently it appeared that facet 

 number and the total length of the immature period were independent. 

 Why do we find this apparent correlation? 



The facet-determining reaction has been shown to be of relatively 

 short duration. It is obvious that a change in temperature follow- 

 ing its completion could affect the total length of the immature 

 period without affecting the facet number. 



We may conclude that the number of facets and the length of the 

 immature period are not directly dependent but rather that the 

 former is determined by a specific reaction the rate of which is cor- 

 related with that of the general metabolic processes extant while this 

 particular phase of development is going on. 



