PLATE 



ni. 



Is copied fiom Malpiglil Appendix de ovo Incubato. T 



and icprc- 



fents the chick in the egg on tlie fourteenth day of incuhation. The chick relied up 

 fwims in the amnios a a, which is kept moift by very minute veffels. Round this is 

 placed the yolk b b, to which adjoins the thicker part of the white. The whole is fur- 

 rounded with chorion d d d. On this are fpread the blood-veflels, of which tlie large 

 one e emerging from the navel of the chick, and generating the various branches ///, 

 terminates in a capillary network. In contad with thefe a redder fet of veffels paffes 

 with fimilar ramifications. Another fet of veffels ^ ^ arifes from the navel, which are 

 fmaller ones, and are propagated amidft the ramification of//. The lungs are white ; 

 the ftomach full of milk, or of coagulated albumen or white ; and the inteflines hang 

 out from the navel. 



• < 



As two fets of blood- veffels terminate on the chorion, and as one branch of the larger 

 fet carries redder blood, and as the lungs are ftill white ; it feems evident, that this larger 

 fet of veffels refemble the placental arteries and vein of viviparous animals, and that the 

 blood receives its red colour by acquiring oxygen from the air included between the exter- 

 nal moift membrane and the (liell of the egg ; which air at firft is feen only at the broad 

 end, but afterwards extends from thence to the equator of the egg, and probably paffes 



««d of the fhell 



to it. 



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