Of those which the shoulders can perform, simple motions are the principal, such as moving the arm upwards and downwards, backwards and forwards.
Plate 14.
Chap. 89.
Page 37.
London Published by J. Taylor High Holborn.
Though one might almost call those motions infinite, for if the arm can trace a circle upon a wall, it will have performed all the motions belonging to the shoulders. Every continued quantity being divisible ad infinitum, and this circle being a continued quantity, produced by the motion of the arm going through every part of the circumference, it follows, that the motions of the shoulders may also be said to be infinite.
