264 BEVERLY WAUGH KUNKEL 



In summing up the results of these experiments, it may be ^aid 

 that they agree essentially with those already determined for 

 vertebrates, but are far less striking. Feeding larvae of Lucilia 

 exclusively upon mammalian thyroid tends to retard slightly the 

 growth of the larvae and consequently to reduce the size of the 

 resulting pupae, while thymus tends to increase their size. 

 Thyroid feeding tends to hasten the onset of pupation and to 

 shorten the period of pupation. 



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