student is all but invulnerable to pain unless really vicious attack is made.
When the student has been engaged for some weeks in toughening the lower edge of his hand along the lines described in Chapter I., he is now ready for experiment in a branch of jiu-jitsu which, when employed with the dexterity that comes of practice, will put him in possession of several defensive tricks of the utmost value. First of all he should select a point on the upper, or thumb, edge of the left wrist. This point is about two inches back of the base of the hand. The lower edge of the right hand is struck, at an angle of forty-five degrees, against the left wrist at the point mentioned. The blow must be a sharp one, and a springy one. The instant that the right hand has struck the left wrist the right hand should be withdrawn with a lightning-like rebound.
When the blow is struck without quick recoil it is not nearly as effective. The same work may be employed at every point of the arm. It is especially effective against the inside of the elbow. Some of the modern schools of jiu-jitsu teach the use of this blow with the
