is the alternate contraction and dilatation of the heart and arteries. As the beats of the arteries correspond with the motions of the heart, we can determine from the pulsation of the arteries the state of the circulation, which is highly valuable in many forms of disease. When in a healthy state the pulse beats about 72 times in a minute, or it ranges from 60 to 80 times. It is quicker in women than in men; and it is quicker in the sanguine than in the melancholic temperament, in youth than in age. The pulse of an infant is from 130 to 140; and during the first year it averages from 108 to 120. In feverish complaints it ranges from 100 upwards to 120, 168, and even becomes innumerable. The radial artery is usually chosen for ascertaining the state of the circulation, where it is conveniently seated in the wrist. When this cannot be reached, the temporal artery, at the corner of the lower jaw, may be tried.