PI. II. 



Germs or Embryos 







^ * -«,-'W*«fy^-^ 



t^ -^K»^rj,l 





/ 





^4 ^S?' 









"«s 





-5a. 





^^ 



'v.. 



^^\ 



*v¥~ 





'/ctV,:, 



^:?^- :^ K 



%ft£^> 







?V-v . 



5 



"■-? 



|r .—« 





/ 





vA^^j, 



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1 i- 





— rw — 



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mm:- 



Fig K 

 Chick 'MfMySt 



?:'. Fore-brain, z. Twixt-brain. m. Mid-brain, /i. Hind-Brain. 

 n. After-brain, w. Spine, r. Spinal-cord. 



