NOT EUGENESIC. 27 



than the individuals of the pure race, or if one of the crossing 

 is more productive than the inverse crossing, as is observed in 

 certain cases of hybridity, which approach more or less of uni- 

 lateral hybridity. The existence of one of these phenomena 

 might prove that the two races are not homogeneous, and 

 might lead us to think that they are not of the same species. 



The monogenists, who have based the demonstration of the 

 unity of the human species upon the physiological character of 

 the prolificacy of the cross-breeds, have not taken into ac- 

 count these elements. They have confined themselves to the 

 assertions that all human races can produce cross-breeds, and 

 that all these breeds are prolific. Now, admitting for a mo- 

 ment that these assertions are exact, the conclusion they have 

 drawn from them is still contestable, until they can demon- 

 strate that the study of these cross-breeds reveals no genital 

 inequality between the parent races. 



But what becomes of their argumentation, if it be proved 

 that all intermixtures are not eugenistic, that is to say, that 

 certain mongrels are not between themselves indefinitely pro- 

 lific ; that other cross-breeds become sterile in the first gene- 

 ration ; and, finally, that certain races are so little homoge- 

 nesic, that the birth of cross-breeds of the first degree is more 

 or less exceptional ? If one of these propositions can be effec- 

 tually established, the monogenists would have little cause to 

 congratulate themselves for having appealed to physiology. 

 They would, on the contrary, have furnished their adversaries 

 with deadly weapons, and their doctrine would be demolished 

 on the battle field they have themselves chosen. 



The facts I intend to exhibit tend to prove that it was a 

 great error to consider all intermixtures of men as eugenesic. 

 Obliged as I am to refer to testimonies which, perhaps, do 

 not always exhibit a desirable precision, some doubts may 

 hover over my conclusion ; this much, however, will result 

 from this sketch, that the examination of the laws of hybridity 

 is far from being favourable to the doctrine of monogenists. 



We shall study the cross-breeds both in relation to their 

 fecundity and their physical and moral validity ; for, from our 

 point of view, it is sufficient to prove that certain cross-brei-ds 



