CHORIO-ALLAXTOIC GRAFTS. 



291 



thought on macroscopic examination, that this would prove to be 

 the lens, but on section, a very different picture presented itself. 

 The implemented portion is the point at which the optic nerve 

 leave- 1 he retinal area and runs out into the mesenehyme (Fig. 5). 



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( X 140.) flr.. l.ram. i :.itje. Opt.\.. . 



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The |M ten i- |>n-t m though irregular in -hapr, due no doubt to 

 tin- nuvli.niiral Stress in t hr growth after Iran-plantation. 1 r<>in 

 this point the optic nerve gri >\vs out between the tapet inn and the 

 eriddennal wall of the chorioiiic membrane for c|uite a di-lance. 

 Tlu- otluT white area in the ^ruft is brain ti tie whifh was ti.m-- 

 planted \\ith the optic cup. Only in the region of the ner\e and 

 nervous ti--ue i- there any mesenclu me or cartilage in abundance. 

 In the re-t of th( .the tapet uni comes uj> cio-e to t he border 



ot the chorioni* or the allantoic nieseiu'lu me of the nienibraiie. 

 The l.i\-ei> of the retina are all well differentiated. The ora ser- 

 rata appear- near the margin of a much di-torted leii-, ending \\ 

 it- lenticular border in a much convoluted and di-or^ani/ed 

 ciliary process. The mi--hapcn appearanci- of the len- i- ap- 

 parenth- due to the fact that it lie- next to the -hell membrane and 

 20 



