ENDOCRINE ARITHMETIC 



shooting in the dark. Our conclusions and estimates are sure 

 to be better in time to come. Meanwhile the reader will per- 

 ceive that after the excitement and drama of the pioneer 

 phase of research on the ovarian hormones, we are in for a 

 lot of tedious, unspectacular measurement and computation, 

 until the reactions of these substances in the body are quan- 

 titatively known as well as the chemist knows the reactions 

 in his flasks. Then, as Lord Kelvin said, we shall really under- 

 stand our subject. 



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