FIGURES 8 AND 9 



8 Transverse section of 10 mm. cut embryo (series 120, slide IX, section 25) 

 X 300. 



9 Same, section 26. 



1 Sympathetic nerve. 



68 Left postcardinal vein. 



73 Left dorsal aorta. 



77 Mesenchymal intercellular lymphatic anlages. 



78 Coelom. 



