Herbert M. Evans 201 
venules, a unit but the size of such a unit will be found to vary with that 
of the lymphatic. In some places, however, the size of these vessels is 
fairly constant, and their distance apart is apparently only governed 
by the length of the capillary bed. Fig. 3 shows such an example. The 
Fic. 5. Blood-supply of lacteal of a diameter of half a millimeter. Ac- 
companying artery and vein on each side.  X 50. 
delicate plexus formed is commonly so distinct and communicates with 
that of the muscularis so seldom that it is not possible to mistake it. 
One may sometimes see the junction of two of these larger serosal 
lymphatics supplied by the tips of an artery and vein which reach the 
angle between the two, after having supplied both trunks for some 
