AN ANATOMICAL STUDY ON THE 



and the whole genus of zoophytes or plant-animals 

 have no heart, for the whole body functions as a 

 heart, and the animal itself is a heart. 



In almost the entire family of insects we cannot 

 clearly discern a heart because of the smallness of 

 the body. In bees, flies, hornets, and the like, one 

 can see with a magnifying glass something pulsate. 

 Likewise in lice, in which, since they are translucent, 

 you can easily watch, with a magnifying glass^ for 

 enlarging, the passage of food like a black spot 

 through the intestines. 



In bloodless and colder animals as snails, shrimps, 

 and shell-fish there is a pulsating place like a vesicle 

 or auricle without a heart. This may be seen beating 

 and contracting, slowly indeed, and only in the sum- 

 mer or warmer seasons. 



In these this part is fashioned because there 

 is need for some impulse to distribute nutriment 

 on account of the variety of separate organs or the 

 denseness of their substance. But the beats are 

 seldom and sometimes entirely fail through cold. This 

 is appropriate to their doubtful nature as they 

 sometimes seem living, sometimes dying, some- 

 times showing the vitality of animals, sometimes of 



2 In the miserable little Longhine edition, Bonn, 1697, with the 

 Archbishop's imprimatur, the word microscopia is inserted. I was 

 using this edition for translating, and was greatly puzzled that Har- 

 vey should have employed such a term. When Dr. John F. Fulton 

 kindly sent me a facsimile of the original edition, my difficulties 

 were not over, but just beginning, for I then had to check over my 

 whole translation, to avoid any other such errors! 



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