FIGURES 230 TO 233 



230 Same, slide X\' , section 10. 



231 Same, section 11. 



232 Same, section 14. 



233 Same, section 16. 



1 Sympathetic nerve. 



2 Intersegmental arteries. 



3 Right azygos vein, thoracic portion. 



4 Atrophying embryonal vein, forming kernel in interior of developing 



and replacing lymj)hatic space. 



5 Extraintimal or perivenous lymphatic space surrounding degenerating 



embryonal vein. 

 G Left azygos vein, thoracic postion. 

 7 Aorta. 

 S Oesophagus. 



