The Lymphatics.~--While the blood is passing through the capillaries, some of the white corpuscles escape from the blood-vessels.
What do you suppose becomes of these runaway corpuscles?
Nature has provided a way by which they can get back to the heart.

In the little spaces among the tissues outside of the blood-vessels very minute channels called _lymph channels_ or _lymphatics_ (lym--phat'-ics) begin.
The whole body is filled with these small channels, which run together much like the meshes of a net.

In the centre of the body the small lymphatics run into large ones, which empty into the veins near the heart.

This is the way the stray white blood corpuscles get back into the blood.
~14.

The Lymph.~--In the lymph channels the white corpuscles float in a colorless fluid called _lymph_.