Section 74. Here also, we may notice the lymphatics, a series of

small vessels which return the overflow of the blood serum from the

capillaries, in the nutrition of the tissues in all parts of the body,

to the thoracic duct (see Section 36), and the general circulation. At

intervals their course is interrupted by gland-like dilatations, the

lymphatic glands, in which masses of rapidly dividing and growing

(proliferating) cells occur, of which, doubtless, many are detached and

become, first "lymph corpuscles," and, when they reach the veins,

white blood corpuscles.

5. _The Skeleton_