FIGURE 1 



1 Transverse section of 10 mm. cat embryo (series 111, slide VIII, section 4), 

 X 175 Topographical picture of site of earliest lymphatic space development. 



1 Sympathetic nerve. 



8 Oesophagus. 



68 Left postcardinal vein. 



69 Lungs. 



72 Right dorsal aorta. 



73 Left dorsal aorta. 



77 Mesenohymal intercellular lymphatic anlages. 



78 Coelom. 



