to4 EXAMINATION OF 



chick from the white of the egg, the motion of 

 the heart continued for a whole day. In 14 

 hours more, or 62 hours from the beginning of 

 incubation, the chick, though ftronger, remained 

 ftiil with its head bended in the hquor of the 

 amnios : Veins and arteries were perceived 

 in the brain; and the hneaments of the 

 eyes, and of the fpinal marrow, appeared. Ac 

 the end of three days, the body of the chick 

 was crooked. Befide the two eyes, five vefi- 

 cles filled with liquor appeared in the liead ; 

 the rudiments of the thighs and of the wings 

 were dlfcernible ; the body began to take on 

 fieili; and the pupils of the eyes, and llkewife 

 the cryftailine and vitreous humours, were dif- 

 tinguifliable. At the termination of the fourth 

 day, the vcficles of the brain Were nearer eacli 

 other; the procefies of the vertebrae were long- 

 er; tlie wings and thighs had become ftronger, 

 in proportion as they grew longer; the v/hole 

 body was covered with an unctuous flefh ; the 

 umbihcal vefTels had pierced through the abdo- 

 men ; and the heart was concealed within the 

 breaft, which was now fhut up by a thin mem- 

 brane. On the fifth, and at the end of the fixth 

 day, the veficles of the brain began to be covered ; 

 the fpinal marrow, which was now more folid, 

 was divided into two parts, and advanced along 

 the trunk; the thighs and wings w^ere longer, 

 and the wings were unfolded ; the abdomen was 

 ihut and tumified; the liver was diftindly vifible, 



and 



