400 DR, E, KLEIN. 
That the anastomosis of the lymph-canalicular system with 
the blood-capillaries appears here so patent and extensive 
may be owing to abnormally delicate capillaries. 
It is possible that in the rabbit the interstitial cement 
substance of the endothelial wall of the capillaries of the 
conjunctiva palpebre is more liable to give way, and to allow 
the injection material to pass from the lymphatic rootlets 
into the blood-capillary. 
IV.—Tue Lympwatics oF THE ORAL CAVITY AND 
PHARYNX. 
35. Teichmann (I. c.), and subsequent writers quoting 
his work, describe the lymphatics of the oral cavity and 
pharynx as being arranged similar to those of the skin, as a 
superficial plexus of fine vessels and a deep one composed 
of large vessels with valves. The superficial plexus is the 
denser of the two, and is in connection with the cecal lym- 
phatics belonging to the papille. 
The observations which I propose to describe here refer to 
the lymphatics of the lips, buccal mucous membrane, the 
palate and pharynx, and the tongue; they were obtained by 
injecting into the mucous membrane, as near as possible to 
the surface of these different regions, asphalt-benzole or 
Berlin blue, in precisely the same manner as was described 
on a former page in connection with the skin. 
The results of these injections confirm, in a general way, 
the observations of Teichmann, but extend them in some 
special details; the relation of the lymphatics of the con- 
nective-tissue ground substance to the epithelium of the sur- 
face, the lymphatics of the glands, and the muscular bundles, 
are points which, in Teichmann’s work, have not been suffi- 
ciently considered, but which, as I shall be able to show, 
deserve special attention. 
As in the case of the skin, so also in that of the mucous 
membranes, it is necessary to consider the lymphatics as 
forming different groups, such as the lymphatics of the 
ground substance of the mucous membrane ; those of the 
fat-tissue, where such is present; those of the glands, 
mucous and serous; and, finally, those of the muscular 
tissue. 
The Lymphatics of the Ground Substance. 
36. In a successful injection into the mucous membrane 
of the lips of the mouth it will be found that there appears 
a very dense and beautiful network of fine lymphatics, 
