PLATE 6 



EXPLANATION OF FIGURES 



Outline drawings representing the development of the cornea, the iris, and 

 the aqueous chamber of the sparrow eye at different ages. The drawings were 

 made by tracing the outlines of sections projected on a screen by a stereopticon. 

 All the figures are of the same magnification. Ac, aqueous chamber; C, conjunc- 

 tival epithelium; Cb, ciliary process; Ch, chorioid; /, iris; L, lens; m, mesoderm; 

 Md, membrane of Descemet; P, pigment portion of the retina; PR, pars ciliaris 

 retinae; R, nervous portion of the retina; St, stratified portion of the cornea, the 

 substantia propria. 



31 Sparrow embryo at the age of 



32 Sparrow embryo at the age of 



33 Sparrow embryo at the age of 



34 Sparrow embryo at the age of 



35 Sparrow embryo at the age of 



36 Sparrow embryo at the age of 



37 Sparrow embryo at the age of 



38 Sparrow embryo at the age of 



39 Sparrow embryo at the age of 10 



40 Sparrow embryo at the age of 11 



41 Sparrow embryo at the age of 12 



42 Sparrow embryo at the age of 13 



days' 

 days' 



ncubation. 



incubation. 



days' incubation. 



days' incubation. 



days' incubation. 



incubation. 



ncubation. 



2 



3 



4 



5 



6 



7\ days' 



8 days' 



days' 

 days' 

 days' 

 days' 



9 days' incubation. 



incubation, 

 ncubation. 

 incubation, 

 incubation. 



334 



