VARIATION AND MENDELIAN INHERITANCE 383 



the hormone formed. As a consequence, we should have more 

 and less masculme males, as well as more and less feminine 

 females. This last, of course, is a quite obvious fact in many 

 species, including man. Granting these differences in the 

 potency of an agent, assumed to modify two characters in oppo- 

 site directions, a negative correlation between these last would 

 necessarily result when the animals of either sex were treated 

 statistically. 



The interesting fact to be reported here is that precisely the 

 opposite relation is found to obtain. Foot length and the 

 length of the pelvis are found to be positively correlated, with a 

 high degree of probability.^^ Accordingly, if these two sec- 

 ondary sexual differences are conditioned by 'hormones' at all 

 (which does not, in itself, seem improbable), there must be at 

 least two such hormones, which vary independently of one 

 another. 



It may be permissible to call attention to the similarity be- 

 tween this situation as regards the sexes and a condition already 

 discussed in considering our geographic races. The case was 

 mentioned of two characters (indeed, these same two charac- 

 ters) which, were correlated within the single race, but which 

 nevertheless were found to have varied in opposite directions, 

 when certain races were compared with one another. Whether 

 such an agreement in behavior in these two cases has any general 

 significance I cannot even conjecture. 



CONSIDERATION OF DATA IN DETAIL 



The ensuing section will consist, for the most part, of a dis- 

 cussion of some figures and tables which present certain portions 

 of my data in graphic or in summarized form. It is upon 

 these that the generalized statements in the first section were 

 chiefly based. 



1^ I will mention here that the evidence for the reality of such a correlation is 

 somewhat stronger than the figures comprized in table 3. (See discussion below.) 

 Measurement of the bones of four more races, now available to me, should render 

 this point decisive. 



