





p 



t.^ *'*'-''to Oi 







Jr. 



^1 



.1/ 



■ii\r 



»w,\ ^ •-'III 



^^ 



•^Si 



'^, r 



c? 



,.4 It I- i,. 





■-,c^ 



Ih. 



Fig. 63. — Plate from Wolff's r//^oWa Gencrationis (1759), Showing 

 Stages in the Development of the Chick. 



