80 D. F. RAMOS 



In a biological study of immigration control, therefore, we must consider 

 the racial and individual differences existing between the native and the 

 immigrant population; this in both their mental and physical characteris- 

 tics, taking into consideration that in each group there exists dominant and 

 recessive inherited characters, and that in order to find this last group 

 mentioned, it will be necessary to study all of the factors of two generations 

 and still be uncertain of obtaining a complete result in our investigation. 



It will be well to bear in mind, too, the environment in which the irnmir 

 grant will live in relation to his biological condition, as well as that from 

 which he comes in reference to sanitary conditions. 



The above suggested study forces us to consider the following : 



A. In relation to race — biological distance from each other. 



B. In relation to individuals. 



1. In each character : 



(a) Maximum, average and minimal level in both countries. 



(b) Convergence or divergence of each character with reference to both 



countries. 



2. In a group of characters: 



(a) A study of the dominant and recessive cacogenic characteristics of the 



immigrating people. 



(b) A study of the principal eugenic characters of both people in relation 



to the harmony that its mixture may produce. 



C. In relation to environment: 



(a) Adaptability of the immigrant to physical demands of the new country. 



(b) Possible transportation of infectious germs by the immigrant. 



It is indispensable, therefore, that in all problems relating to immigra- 

 tion control, the eugenist should study the points indicated in the follow- 

 ing chart so that he may decide on the conditions above referred to : 



/ fRace Biological distance from the other 



Man (Conditions of eachj™" £j* f Convergent 



character \ M inimum LeveA Dlver S ent 



Country Individual _ /Concordant 



^ Gro , u P of f (Eugenics ( D iscordant 



[ characters (Cacogemcs *■ 



j -p, . /Physical conditions of receiving country 



environment ^ Sanitary con ditions of immigrant country 



(b) PRACTICAL METHOD FOR CONTROLLING IMMIGRATION 



I have mentioned, thus far, the scientific points which must be considered 

 in the study of immigration so that the movement may be guided along a 

 path leading to biological improvement of modern countries. But eugenics, 

 is a science of practical application that endeavors to facilitate measures 



