KINETIC DISEASES 219 



male has been chiefly the motor member of the family ; 

 he has been, not exclusively, but for the most part, the 

 hunter, the fighter, the searcher for food, activities 

 which have required increased transformation of energy 

 during short periods of time, with proportionally heavy 

 demands upon the acid-neutralizing mechanism of the 

 body. The female, on the other hand, has borne the 

 burden of procreation and of the lighter but more con- 

 stant domestic tasks, and has been correspondingly 

 dependent upon the mechanism for sustained physio- 

 logic efficiency, represented chiefly by the thyroid. 

 This age-long differentiation may conceivably have 

 led to a corresponding differentiation in the physio- 

 logic expression of emotion, with a corresponding 

 differentiation in the diseases caused by emotion. 

 According to a striking statement made by Loeb, 

 "Man and woman are, physiologically, different 

 species." 



Often, before any one of the more serious diseases 

 resulting from excessive driving of the mechanism is 

 apparent, a warning may be discerned in the onset of 

 some lesser disturbance, such as chronic dyspepsia, 

 auto-intoxication, disturbances of the skin, the teeth 

 and the hair. The increased amounts of unused secre- 

 tions and of by-products of activity tax all the organs 

 of elimination, including the skin. It is not surprising 

 that the skin of many highly emotional but "intelli- 

 gent" persons, in whom we presume control and re- 

 pression, should exhibit a stained and sallow appear- 

 ance, should become odorous and oily, or cold, moist 

 and covered with unsightly blotches and pimples. 

 The skin of virtuous girls, subjected to the continuous 



