FIGURES 258 AND 259 



258 Same, section 32. 



259 Transverse section or lower thoracic region in a 17 mm. cat embryo, 

 (series 258, slide XVIII, section l) X 225. 



1 Sj^mpathetic nerve. 



3 Right azygos vein, thoracic portion. 



6 Left azygos vein, thoracic portion. 



7 Aorta. 



36 Thoracic duct, azygos segment. 

 51 Mesenteric lymphatics. 



