Fig. 10. — From a cleared specimen of a lymphatic injection in an embryo 

 pig 5.5 cm. long. The two main ducts in the thoracic region are seen to fuse 

 into single channels both below the diaphragm and above the arch of the 

 aorta. Numerous channels are seen crossing the aorta. For the lymphatics 

 below the diaphragm, the drawing is slightly misleading, for the specimen 

 was exceedingly transparent, and includes lymphatics of two levels. This 

 complicated area will be made more clear in a paper of Dr. Heuer's soon to 

 be published in this Journal. Between the two kidneys and Wolffian bodies 

 is the large mesenteric sac, lying in front of the aorta ; the leader marked 

 C.C. runs to this mesenteric sac. The cisterna chyli dorsal to the aorta, is 

 entirely concealed by the mesenteric sac. The ducts running anteriorly from 

 the posterior lymph sacs empty into the cisterna chyli dorsal to the mesenteric 

 sac ; they do not empty into it as they appear to do in the figure. C, cervical 

 lymph sac ; C. C, mesenteric sac dorsal to which is the cisterna chyli ; 

 D., primitive thoracic ducts ; W. B., Wolffian bodies ; T., testes ; K., kidneys ; 

 P., posterior lymph sac. 



