46 BIOLOGY. AND ITS MAKERS 
His Great Classic on Movement of the Heart and Blood. 
—Since his book on the circulation of the blood is regarded 
as one of the greatest monuments along the highroad of biol- 
ogy, it is time to make mention of it in particular. Although 
relatively small, it has a long title out of proportion to its 
size: Evercitatio Anatomica de Motu Cordis et Sanguints in 
Animalibus, which may be freely translated, ‘‘ An Anatomical 
Disquisition on the Movement of the Heart and Blood in 
Animals.” The book is usually spoken of under the shorter 
title, De Motu Cordis et Sanguinis. The full title seems some- 
what repellent, but the contents of the book will prove to be 
interesting to general readers. It is a clear, logical demon- 
stration of the subject, proceeding with directness from one 
point to another until the culminating force of the argument 
grows complete and convincing. 
The book in its first edition was a quarto volume of 
seventy-eight pages, published in Frankfort in 1628. An 
interesting facsimile reprint of this work, translated into 
English, was privately reproduced in 1894 by Dr. Moreton 
and published in Canterbury. As stated above, it is known 
that Harvey had presented and demonstrated his views in 
his lectures since 1616. In his book he showed for the first 
time ever in print, that all the blood in the body moves in a 
circuit, and that the beating of the heart supplies the propel- 
ling force. Both ideas were new, and in order to appreciate 
in what sense they were original with Harvey, we must 
inquire into the views of his forerunners. 
Question as to Harvey’s Originality.—The question of 
how near some of his predecessors came to anticipating his 
demonstration of the circulation has been much debated. 
It has been often maintained that Servetus and Realdus 
Columbus held the conception of the circulation for which 
Harvey has become so celebrated. Of the various accounts 
of the views of Harvey’s predecessors, those of Willis, Huxley, 
