ON GENERATION. 253 



feet; in short, all the parts are sketched out, but the eyes, 

 above all, are conspicuous. The viscera, on the contrary, are 

 so indistinct, that Coiter affirms, that whilst he plainly saw the 

 eyes and beak he could discover no viscus, even obscurely and 

 confusedly shadowed forth. 



The changes that take place from the beginning of the sixth 

 to the end of the seventh day, occur for the major part in some 

 eggs more quickly, in others a little more tardily. The coats 

 of the eyes are now visible, but they only include a colourless 

 and limpid fluid in their interior. The eyes themselves project 

 somewhat beyond their orbits, and each of them does not less 

 exceed the brain in size, than the head with which they are 

 connected exceeds the whole of the rest of the body. 



The vesicle, which like a ridge or crest expands beyond the 

 confines of the brain, occupies the place of the cerebellum ; and, 

 like the other vesicles, is filled with a transparent fluid. 



The brain is perceived to be obscurely bipartite, and refracts 

 the light less than the cerebellum, though it is of a whiter colour. 

 And as the heart is seen lying without the confines of the thorax, 

 so likewise does the cerebellum protrude beyond the limits of 

 the head. 



If the head be removed, the vessels ascending to the brain 

 may be observed as bloody points, with the use of a magni- 

 fying glass. And now, too, the rudiments of the spine begin 

 to be first perceived distinct from the rest of the pulp, of a 

 milky colour, but firmer consistence. So in the same way, and 

 like flimsy threads of a spider's web, the ribs and other bones 

 make their appearance in the guise of milky lines, amidst the 

 pulp of the body ; and the same thing appears more clearly in 

 the formation of the larger oviparous animals. The heart, lungs, 

 liver, and by way of intestines certain most delicate filaments, 

 all present themselves of a white colour. The parenchyma of 

 the liver is developed upon delicate fibrous stamens over the 

 umbilical vein at the part where it enters, almost in the same 

 manner as we have said that the rudiments of the body grow 

 to the vein descending from the heart, or the vesicula pulsans. 

 For in the same way as grapes grow upon the stalk of the 

 bunch, buds upon twigs, and the ear upon the straw, does the 

 liver adhere to the umbilical vein, and arise from it, even as 

 fungi do from trees and excessive granulations from ulcers, or as 



