IN MAY. 243 



ments of the head and body of the chicken that is to 

 be born The heart appears to beat at the end of 

 the day ; at the end of forty eight hours two vesicles 

 of blood can be distinguished, the pulsation of which 

 is very visible At the fiftieth hour an auricle of the 

 heart appears, and resembles a lace, or noose folded 

 down upon itself At the end of seventy hours we 

 distinguish wings, and on the head two bubbles for 

 the brain ; one for the bill, and two others for the 

 fore part and hind part of the head : the liver ap- 

 pears towards the fifth day At the end of 131 

 hours the first voluntary motion is observed. At 

 the end of 138 hours the lungs and stomach become 

 visible : and at the end of 142, the intestines, the 

 loins, and the upper jaw The seventh day, the 

 brain which was slimy, begins to have some con- 

 sistence. At the 190th hour of incubation, the bill 

 opens, and the flesh appears in the breast ; at the 

 194th, the sternum is seen, that is to say, the breast- 

 bone. At the 210th, the ribs come out of the back, 

 the bill is very visible, as well as the gall bladder. 

 The bill becomes green at the end of 236 hours ; 

 and if the chick is taken out of its coverings, it evi- 

 dently moves itself The feathers begin to shoot 

 out towards the 240th hour, and the skull becomes 

 grisly. At the 264th, the eyes appear. At the 

 288th the ribs are perfect At the 331st, the spleen 

 draws near to the stomach, and the lungs to the 

 chest. At the end of 355 hours, the bill frequently 

 opens and shuts ; and at the end of 451 hours, or 

 the 18th day, the first cry of the chick is already 



