LYMPHATIC SYSTEM OF SKIN AND MUCOUS MEMBRANES. 405 
plexuses become as it were interrupted by the lymph- 
follicles. 
These latter appear surrounded by saccular lymphatics, 
but also amongst the diffuse masses of adenoid tissue may be 
seen lymphatic vessels. 
In both instances the endothelial wall of the lymphatic is 
directly continuous with the reticulum of the surrounding 
adenoid tissue, in the same manner as I described it both of 
the serous membranes and the bronchial walls in Parts I and 
II of my ‘ Anatomy of the Lymphatic System.’ 
45. The lymphatic vessels of the deeper parts of the 
tongue, that is, of the counective tissue separating the 
muscle-bundles of the tongue, are exceedingly numerous, 
very large, possessed of valves, and anastomosing into a rich 
plexus. Their efferent trunks run in company with the 
large blood-vessels, forming around these a beautiful plexus. 
The arterial branches of the muscular tissue of the tongue, 
as well as those entering the mucous membrane, are generally 
accompanied by one or two lymphatic vessels; in some 
instances these latter appear like sinuses, ¢nvaginating the 
whole or the greater part of the circumference of the blood- 
vessel. 
46. The arrangement of the lymphatics of the fat-tissue, 
in the lip, in the submucous tissue of the soft palate, 
especially at the base of the tongue, being in all respects 
identical with that described of the fat-tissue of the skin, 
does not require any special description; the connection of 
the lymphatic vessels situated in the connective-tissue septa 
between larger or smaller groups of fat-cells with their 
ultimate radicals between the individual fat-cells is very 
distinct in parts, where the lymphatics have been success- 
fully injected. The root of the tongue of the child, rabbit, 
and dog have yielded the best preparations. 
47. The mucous and serous glands in the root of the 
tongue, as well as the mucous glands in other parts of the 
oral cavity and pharynx, possess their own lymphatics. The 
tongue, after its lymphatics had been injected with Berlin 
blue, if hardened and the sections obtained from it stained 
in picro-carmine, yields very beautiful specimens. There 
can be no doubt whatever, that just as in the case of the 
sweat glands of the skin, so also in that of the mucous and 
serous glands, the lymphatic vessels of the surrounding con- 
nective tissue anastomose with sinuous-like clefts surrounding 
more or less of the circumference of the gland-tubes or alveolt. 
These lymph-clefts are situated between the membrana 
