SYSTEM AND suphahenal bodies in the sparrow. 



759 



Sparrow 5, text-fig. 17, shows the separation completed ; the 

 primordia are now compact and contain a few cells from the 

 primary sympathetic chain, which have migrated down the sides 



Text-figure 13. 







:^0;ir''5 



&»-«Sl .^o'iii^ "-f^- 4 



C.G. 



MS. 



A/.A/. 



Trausvevsc section tlirough Sparrow 7 (= 78-lir. chick), showing the formation of 

 the coelomic groove {C.G.). 



C.U. Coelomic cpitlielinm. D.A. Dorsal aorta. M.N. Mosonephros. 

 JLT.S. Mesentery. I.W.V. Internal Wolffian vein. (Sp. 7. 5, 3, 3.) 



Text-figure 14. 



/.py\/. 



M.M 



C.S. 



Transverse section of Sparrow 8, sliowiiig the deepening of tlie groove {C.G.) and 

 proliferation of cl>11s (P.O.) to form the priinordium of the suprarenal cortex. 

 Letters as in fig. 13. 



of the aorta. It is this contribution from the sympathetic chain 

 which eventually forms the medullary tissue of the suprarenal 

 bodv. 



50* 



