Training for responsibility

IN THE SAME WAY THAT AN INVALID DOES NOT BUY EVERY medicine in the chemist's shop, it is not necessary to include every item in a syllabus in a course of training. It isn't even necessary for the chemist to stock every kind of medicine, seeing that demand is very largely determined by a pattern of common ailments, many of which are passed from person to person, or are typical of a given social climate.