FIGURES 1H7 AND 168 



167 Same, section 43 X loO. 

 16S Same, section 44 X loO. 



1 Sjmpathetic nerve. 



4 Atrophyin-i embryonal vein, forming kernel in interior of develop- 



ing and replacing lymphatic space. 



5 Extraintimal or perivenous lymphatic space surrounding degen- 



erating embryonal vein. 

 17 Prevertebral venous plexus. 



