102 E X A M I N A T I O N O F 



marked, is fmaller than in thofe that have received 

 an impregnation. Its margin is often irregular, 

 and its texture fometimes differs in different eggs. 

 Near its centre, in place of a bubble including 

 the foetus, there is a globular mole or unorgani- 

 zed mafs, which, when opened, prefents nothing 

 Hke regularity or arrangement of parts : It has 

 only fome appendages filled with a thick but 

 iranfparcnt liquor; and this unformed mafs is 

 furrounded and enveloped in feveral concentric 

 circles. 



After fix hours incubation, the cicatrice is con- 

 fiderably enlarged; and, in its centre, a bubble 

 or globule formed by the amnios is eafily di~ 

 ftinguiihable. This globule is filled with a fluid, 

 in the middle of w^hich the head and back-bone 

 of the chick vifibly appear. Six hours after, 

 every thing is enlarged, and, of courle, more 

 apparent to the eye. In fix hours more, that 

 is, 1 8 hours after the commencement of in- 

 cubation, the head is larger, and the fpine is 

 lengthened ; and, at the end of 24 hours, the 

 head of the chick appears in a bended pofture, 

 and the Ipine is of a whitiih colour. The ver- 

 tebrae are ranged on each fide of the fpine, like 

 fmall globules ; and, nearly at the fame time, 

 the wings begin to fprout, and the head, neck, 

 and breaft, are lengthened. At the end of 30 

 hours, nothing new appears; but" all the parts 

 are enlarged, and efpecialJy the amnios. Round 

 this membrane may be remarked the umbilical 



vefUl?, 



