In the girls there is a less general prevalence of a predaceous interval in the development; and in the cases where it occurs, the predaceous and isolating attitude during the interval is commonly less accentuated.
In the male child the predaceous interval is ordinarily fairly well marked and lasts for some time, but it is commonly terminated (if at all) with the attainment of maturity.

This last statement may need very material qualification.

The cases are by no means rare in which the transition from the boyish to the adult temperament is not made, or is made only partially--understanding by the "adult" temperament the average temperament of those adult individuals in modern industrial life who have some serviceability for the purposes of the collective life process, and who may therefore be said to make up the effective average of the industrial community.
The ethnic composition of the European populations varies.

In some cases even the lower classes are in large measure made up of the peace-disturbing dolicho-blond; while in others this ethnic element is found chiefly among the hereditary leisure class.

The fighting habit seems to prevail to a less extent among the working-class boys in the latter class of populations than among the boys of the upper classes or among those of the populations first named.
If this generalization as to the temperament of the boy among the working classes should be found true on a fuller and closer scrutiny of the field, it would add force to the view that the bellicose temperament is in some appreciable degree a race characteristic; it appears to enter more largely into the make-up of the dominant, upper-class ethnic type--the dolicho-blond--of the European countries than into the subservient, lower-class types of man which are conceived to constitute the body of the population of the same communities.
The case of the boy may seem not to bear seriously on the question of the relative endowment of prowess with which the several classes of society are gifted; but it is at least of some value as going to show that this fighting impulse belongs to a more archaic temperament than that possessed by the average adult man of the industrious classes.