I t has been estimated that one-tenth of all civilised people have some physical disability serious enough to cripple them for life in one way or another. Defects of vision, for instance, beyond the oculist's power to correct, defects of internal organs, such as a bad heart-valve or a stomach that will not do its work adequately; defects of frame, such as a misshapen skeleton, an imperfect limb — I am only mentioning a few of the most familiar types.