92 EXAMINATION OF 



When the egg has been heated for 24 hours, 

 the yolk, which was formerly in the centre, 

 rifes towards- the cavity at the thick end of the 

 ^gg. This cavity continues to enlarge by the 

 evaporation of the more fluid part of the white; 

 and the heavieft part of the while falls down to 

 the fmall end. The cicatrice or fpeck on the 

 membrane of the yolk, is elevated along with 

 it, and applies itfelf to the membrane which 

 lines the cavity at the thick end. This fpeck 

 is now as large as a pea; and a white point is 

 diftincruifhable in the middle of it, with feveral 

 circles, of which this point appears to be the 

 common centre. 



At the end of the fecond day, thefe circles are 

 larger and more confpicuous, and they divide the 

 fpeck fometimes into two, and fometimes into 

 three parts, of different colours. A fmall external 

 protuberance likewife appears, which nearly re- 

 fembles a little eye, with a white point or cata- 

 radlon the pupil. Between the circles, a liquor, 

 as tranfparent ascryllal, is contained by means ot 

 a very thin membrane. The fpeck, which is 

 now become a kind of bubble, or liquid globe, 

 appears as if it were fituated in the white, rather 

 than on the membrane of the yolk. On the third 

 day the traniparent liquor, as well as the mem- 

 brane in which it is inclofed, isconfiderably aug-^ 

 mented. On t,he 4th, a fmall line of blood, of 

 a purple colour, appears on the circumference of 

 •the bubble ; and, at a little diftance from the 

 centre, we perceive a dot or point, of a bloody 



colourj 



