It was reserved for the immortal Harvey to put into practice the experimental method by which he demonstrated conclusively that the blood moved in a circle.

The "De Motu Cordis" marks the final break of the modern spirit with the old traditions.

It took long for men to realize the value of this "inventum mirabile" used so effectively by the Alexandrians--by Galen--indeed, its full value has only been appreciated within the past century.

Let me quote a paragraph from my Harveian Oration.( 33) "To the age of the hearer, in which men had heard and heard only, had succeeded the age of the eye in which men had seen and had been content only to see.

But at last came the age of the hand--the thinking, devising, planning hand, the hand as an instrument of the mind, now re-introduced into the world in a modest little monograph from which we may date the beginning of experimental medicine." (33) Osler: An Alabama Student, etc., pp.