Page:Popular Science Monthly Volume 51.djvu/780

762 equal one of fifteen years not so trained. Four of the teachers place the gain at from forty to fifty per cent in study power. One teacher (class position 44) puts the gain at one hundred per



cent in geometry, claiming to have covered certain ground satisfactorily in half the time usually needed for a class without the special training.

By imagining line No. 3 (the high limit of group) prolonged downward and to the left, three years, and line No. 2 treated in the same way to the same age (one year), it will be seen that at the age of twelve months children are almost infinitely separated