(See Fig.

4.) [Illustration: FIG.

4 .-- GRIND In the "Grind" special precaution should be taken not to let the center of the circle, that the hands are making, come in front of the shoulders; an attempt should almost be made to make the shoulder-blades meet.

This is particularly necessary on the reverse.] Then to a measured counting--"One, two, three, four, five," up to ten--circles of twelve-inch diameter are described with the finger tips, the latter moving forward and upward, the arms remaining stiff and pivoting from the shoulders.

On the backward movement of the circle the arms should be forced back to the limit.