THE HORMONES IN HUMAN REPRODUCTION 



Fio. 3. A one-celled animal, Trichospherium, reproducing itself by the 

 formation of spores. In this kind of reproduction the original "parent" 

 ceases to exist as an individual, being completely dispersed into its 

 offspring. Greatly magnified. After Schaudinn. 



Fio. 4. The marine worm Autolytus reproducing itself by transverse 

 fission. At a, a new head is forming, and the rear part of the worm 

 will soon drop off to become a separate individual. Magnified. After 

 Alexander Agassiz. 



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