MULTIPLICATION OF THE HUMAN RACE. 521 



with the density of population, the values of agricultural and manu 

 factured products, and the mortgage indebtedness.&quot; 



Of course multitudinous differences of race, class, mode 

 of living, occupation, locality, make it difficult to draw posi 

 tive inferences from the data ; but the inferences above drawn 

 are held to remain outstanding after allowing for all the 

 qualifying conditions.] 



