AN ANATOMICAL STUDY ON THE 



heart from the white of the egg, the other from the 

 yolk ending in the portal vein. The chick is de- 

 veloped and nourished first by the white, then 

 after it is formed and leaves the shell, from the 

 yolk. One may find the yolk in the stomach of a 

 chick many days after hatching, for it serves in- 

 stead of the milk in other animals. 



These matters, however, may be more appro- 

 priate to notes on the formation of the fetus, where 

 many problems of the following sort can be dis- 

 cussed. Why is one part formed first, another 

 later? Concerning the origin of organs, whether 

 one may be a cause of another, and much about 

 the heart. Why, as Aristotle points out (De Part. 

 Animal^ Lib. j), is it the first to take shape, and 

 seem to have life, motion, and sensation before 

 any other part of the body? Likewise, why does 

 blood appear before anything else, and how does 

 it possess the vital animal principle? How does 

 it desire to be moved here and there, for which 

 reason the heart seems to be provided? 



In the same way, speculating on the pulse, why 

 does one kind indicate death, another recovery? 

 In considering all varieties of pulse, what do they 

 signify and why? Likewise, in discussing crises, 

 natural discharges, nutrition, the distribution of 

 nutriment, and fluxes. 



Finally, in considering all phases of medicine, 

 physiology, pathology, and therapeutics, I realize 

 how many problems may be answered, how many 



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