So far we simply have made the point that individuals differ. We are concerned in this chapter in knowing how these differences affect the teaching process. Fully to appreciate their significance we must know not only that they exist, and the degree of their variation, but also the forces that produce them. On the side of heredity, race, family, and sex, are the great modifying factors. Practically, of course, we are concerned very little as Church teachers with problems of race. We are all so nearly one in that regard that a discussion of racial differences would contribute but little to the solution of our teaching problem.

The matter of family heritage is a problem of very much more immediate concern. Someone has happily said: "Really to know a boy one must know fully his father and his mother." "Yes," says a commentator, "and he ought to know a deal about the grandfather and grandmother." The significance of parentage is made to stand out with clearness in the following paragraph from Norsworthy and Whitley, The Psychology of Childhood:

"Just as good eyesight and longevity are family characteristics, so also color blindness, left-handedness, some slight peculiarity of structure such as an extra finger or toe, or the Hapsburg lip, sense defects such as deafness or blindness, tendencies to certain diseases, especially those of the nervous system,—all these run in families. Certain mental traits likewise are obviously handed down from parents to child, such as strong will, memory for faces, musical imagination, abilities in mathematics or the languages, artistic talent. In these ways and many others children resemble their parents. The same general law holds of likes and dislikes, of temperamental qualities such as quick temper, vivacity, lovableness, moodiness. In all traits, characteristics, features, powers both physical and mental and to some extent moral also, children's original nature, their stock in trade, is determined by their immediate ancestry. 'We inherit our parents' tempers, our parents' conscientiousness, shyness and ability, as we inherit their stature, forearm and span,' says Pearson."

The teacher who would really appreciate the feelings and responses of a boy in his class must be aware, therefore, that the boy is not merely one of a dozen type individuals—he is a product of a particular parentage, acting as he does largely because "he was born that way."

We shall point out in connection with environmental influences the importance of a teacher's knowing the home condition of his pupils; but it is important here, in passing, to emphasize the point that even though a child were never to live with its parents it could be understood by the teacher acquainted with the peculiar traits of those parents. "Born with a bent" is a proverb of such force that it cannot be ignored. To know the parental heritage of a boy is to anticipate his reaction to stimuli—is to know what approach to make to win him.

Because of the fact that in many of our organizations we are concerned with the problem of teaching boys and girls together, the question of the influence of sex is one which we must face. There are those who hold that boys and girls are so fundamentally different by nature that they ought not to be taught coeducationally. Others maintain that they are essentially alike in feeling and intellectuality, and that because of the fact that eventually they are to be mated in the great partnership of life they should be held together as much as possible during the younger years of their lives. Most authorities are agreed that boys and girls differ not so much because they are possessed of different native tendencies, but because they live differently—they follow different lines of activity, and therefore develop different interests. To quote again from Norsworthy and Whitley:

"That men and women are different, that their natures are not the same, has long been an accepted fact. Out of this fact of difference have grown many hot discussions as to the superiority of one or the other nature as a whole. The present point of view of scientists seems well expressed by Ellis when he says, 'We may regard all such discussions as absolutely futile and foolish. If it is a question of determining the existence and significance of some particular physical sexual difference, a conclusion may not be impossible. To make any broad statement of the phenomena is to recognize that no general conclusion is possible. Now and again we come across facts which group themselves with a certain uniformity, but as we continue, we find other equally important facts which group themselves with equal uniformity in another sense. The result produces compensation.' The question of interest then is, what in nature is peculiar to the male sex and what to the female? What traits will be true of a boy, merely because he is a boy, and vice versa? This has been an extremely difficult question to answer, because of the difficulty encountered in trying to eliminate the influence of environment and training. Boys are what they are because of their original nature plus their surroundings. Some would claim that if we could give boys and girls the same surroundings, the same social requirements, the same treatment from babyhood, there would be no difference in the resulting natures. Training undoubtedly accentuates inborn sex differences, and it is true that a reversal of training does lessen this difference; however, the weight of opinion at present is that differences in intellect and character do exist because of differences of sex, but that these have been unduly magnified. H.B. Thompson, in her investigation entitled The Mental Traits of Sex, finds that 'Motor ability in most of its forms is better developed in men than in women. In strength, rapidity of movement, and rate of fatigue, they have a very decided advantage, and in precision of movement a slight advantage.... The thresholds are on the whole lower in women, discriminative sensibility is on the whole better in men.... All these differences, however, are slight. As for the intellectual faculties, women are decidedly superior to men in memory, and possibly more rapid in associative thinking. Men are probably superior in ingenuity.... The data on the life of feeling indicate that there is little, if any, sexual difference in the degree of domination by emotion, and that social consciousness is more prominent in men, and religious consciousness in women.'

"Pearson, in his measurement of traits, not by objective tests but by opinions of people who know the individual, finds that boys are more athletic, noisy, self-assertive, self-conscious; less popular, duller in conscience, quicker-tempered, less sullen, a little duller intellectually and less efficient in penmanship. Heymans and Wiersma, following the same general method as Pearson, state as their general conclusions that the female is more active, more emotional, and more unselfish than the male. 'They consider women to be more impulsive, less efficient intellectually, and more fickle than men as a result of the first two differences mentioned above; to be gifted in music, acting, conversation and the invention of stories, as a result in part of the second difference; and to think well of people and to be easily reconciled to them as a result of the third.' Thorndike finds the chief differences to be that the female varies less from the average standard, is more observant of small visual details, less often color-blind, less interested in things and their mechanisms, more interested in people and their feelings, less given to pursuing, capturing and maltreating living things, and more given to nursing, comforting and relieving them than is the male. H. Ellis considers the chief differences to be the less tendency to variability, the greater affectability, and the greater primitiveness of the female mind, and the less ability shown by women in dealing with the more remote and abstract interests in life. All the authors emphasize the smallness of the differences; and after all the striking thing is not the differences between the sexes, but the great difference within the same sex in respect to every mental trait tested. The difference of man from man, and woman from woman, in any trait is almost as great as the differences between the sexes in that trait. Sex can be the cause, then, of only a fraction of the difference between the original nature of individuals."

It is reasonably certain, then, that a teacher may safely appeal to both boys and girls on the ground of the fundamental instincts, feeling confident that common stimuli will produce largely the same results.

Important as it is that we know what our pupils are from their parentage, it is even more important in the matter of religious instruction that we shall appreciate the force of the varieties of environment that have been operative. Though boys and girls may be essentially alike at the outset of their lives they may be thrown into such associations as to make their ideals and conduct entirely different. Fancy the contrast between the case of a girl brought up for fifteen years in a household of refinement and in a companionship of gentility, and the case of a boy who during the same years has been the pal of bullies on street corners. Surely stimuli that are to promote proper reaction in these two cases will have to be suited to the person in question.