It might well be added to this part of the subject, that granted that developmental changes were often small, that progress was attained little by little, this does not appear to have been always the case.
"Creation and Its Records"
B.H. Baden-Powell
But it is quite intelligible, and touches on no dangerous ground, when we assert that there is a distinct ascent-an interval again raising developmental difficulties, directly we pass from the intellectual to the moral.
"Creation and Its Records"
B.H. Baden-Powell
What essentials must we provide if we would deliberately plan an environment to promote the developmental possibilities of play?
"A Catalogue of Play Equipment"
Jean Lee Hunt