Herbert M. Evans 199 
accompanying vessels exist. Such a lymphatic may be said to have a 
bilateral blood-supply. Not only are these accompanying vessels at 
opposite points on the circumference of the lacteal wall, but the col- 
Fig. 3. The blood-supply of a large serosal lymphatic from the walls of 
the human ileum. X 45. | 
lapsed lymphatic always flattens so that they may be found coursing along 
its lateral margins. These may then be known as axes of blood-supply 
and are single or double, according as the supply is unilateral or bilateral. 
