The typical advanced case of rickets presenting marked bowing of the legs and other exaggerated deformities is easily recognized and could, in fact, scarcely be overlooked. That the malady can ever be allowed to reach this extreme stage, as so frequently happens, is but another instance of the strange parental blindness to forms of disease which progress so insidiously that the departure from the normal is not recognized. This perhaps arises from such constant familiarity with the infant's appearance that its peculiarities come in some way to be accepted as belonging naturally to the individual. In no other way can we account for the degree of bony deformity which takes place before the parents awaken to the necessity of seeking medical assistance, and even when such children are finally brought to the physician it is not, in a large proportion of the cases, because of the most obvious effects, but