WHAT IT MEANS 69 



the same ancestor contaminated by that of the name- 

 less feeble-minded girl. 



From this comparison the conclusion is inevitable 

 that all this degeneracy has come as the result of the 

 defective mentality and bad blood having been brought 

 into the normal family of good blood, first from the 

 nameless feeble-minded girl and- later by additional 

 contaminations from other sources. 



The biologist could hardly plan and carry out a more 

 rigid experiment or one from which the conclusions 

 would follow more inevitably. 



