ABSTRACT
ON the basis of the conclusions derived from the considerations discussed in the previous chapter, it was decided to institute a programme of research in comparative psychogenetics using the two techniques available to us, selective breeding and the study of pure strains and their crosses. As in any work on the study of inherited capacities, the methods employed in the general maintenance of the subjects, and the control of their environment, are of great importance. Some consideration must therefore be given to the measures taken in the present studies to effect this control.
