FIG. 141. THE GROWING END OF A DEVELOPING LYMPHATIC VESSEL IN THE SUBCU- 

 TANEOUS TISSUE OF A FETAL PIG. 



The lumen of the vessel has been filled with a dark injection mass. Highly magnified. 

 (After MacCallum.) 



FIG. 142. LYMPHATIC AND BLOOD VESSELS IN THE HILUM OK A HUMAN LYMPHATIC 



NODE. 



a, lymphatic vessels ; 6, blood vessels. Henmtein and eosin. * Photo, x 160. 



143 



