Or if, as is the case in civilized countries, nurses largely replace the mothers, it would be necessary that most of the nurses be left-handed in order to make most of the children right-handed.

Now, none of these deductions are true.

Further, the child, as a matter of fact, holds on with both hands, however it is itself held.
Another theory maintains that the development of right-handedness is due to differences in weight of the two lateral halves of the body; this tends to bring more strain on one side than the other, and to give more exercise, and so more development, to that side.

This evidently assumes that children are not right or left-handed before they learn to stand.

This my results given below show to be false.
Again, we are told that infants get right-handed by being placed on one side too much for sleep; this can be shown to have little force also when the precaution is taken to place the child alternately on its right and left sides for its sleeping periods.
In the case of the child H., certain precautions were carefully enforced.