[Injurious action of ultrasonics]

It was felt to be advisable to insist on the harmful action of ultrasounds, since their use in the field of medical therapy is relatively recent and, after causing exaggerated enthusiasm, they now appear to be relagated to the rank of useless accessories. The truth is more tempered and this physical agent must be numbered among the most interesting ones, provided that the technique of its application is perfect and that account is taken of the possibility of incidents or accidents which can be caused by incomplete knowledge thereof.