MOTION OF THE HEART ANB BLOOD 



great clearness. Since the outside of the body did 

 not block our view, we could observe the least 

 tremor of the heart, as through a window. 



I have seen the first rudiments of the chick as a 

 little cloud in the hen's egg about the fourth or fifth 

 day of incubation, with the shell removed and the 

 egg placed in clear warm water. In the center of 

 the cloud there was a throbbing point of blood, so 

 trifling that it disappeared on contraction and was 

 lost to sight, while on relaxation it appeared again 

 like a red pin-point. Throbbing between existence 

 and non-existence, now visible, now invisible, it was 

 the beginning of life. 



46 j 



