190o.] On the Reduction Phenomena of Animals and Plants. 107 

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Fig. i. 



Fig. 2. 



. 3. 



Fig. 4. 



Fig. 5. Fig-. 6. 



In Blatta,* the original longitudinal split is, as we have said, apparent 



* The investigation of spermatogenesis in this insect was undertaken by Mr. L. 

 Robinson, in conjunction with ourselves. His results will be presented in the 

 final memoir. 



