8 



THE BLOOD 



succeeded, and had escaped and got out of this 

 labyrinth, and therewith had discovered what I 

 desired, the movement and use of the heart and 

 the arteries. And from that time, not only to my 

 friends, but also in public in my anatomical lectures, 

 after the manner of the Academy, I did not fear to 

 set forth my opinion in this matter." 



It is plain, from Harvey's own words, that he 

 gives to experiments on animals a foremost place 

 among his methods of work. Take only the 

 headings of his first four chapters : — 



i. Causes, quibus ad scribendum auctor permotus 



fuerit. 



ii. Ex vivorum dissect tone, qualis fit cordis motus. 



iii. Arteriarum motus qualis, ex vivorum dissec- 



tione. 



iv. Motus cordis et auricularum qualis, ex vivorum 



dissectione. 



He thrusts it on us, he puts it in the foreground. 

 Read the end of his Preface : — 



" Therefore, from these and many more things 

 of the kind, it is plain (since what has been said 

 by men before me, of the movement and use of 

 the heart and arteries, appears inconsistent or 

 obscure or impossible when one carefully con- 

 siders it) that we shall do well to look deeper 

 into the matter ; to observe the movements of the 

 arteries and the heart, not only in man, but in 

 all animals that have hearts ; and by frequent 

 dissection of living animals, and much use of our 

 own eyes, to discern and investigate the truth — 

 vivorum dissectione frequenti, multdque autopsid, 

 veritatem discernere et investigare" 



