LYMPHATIC SYSTEM OF SKIN AND MUCOUS MEMBRANES. 397 
and a 2 to 4 per cent. solution of Briicke’s Berlin blue being 
used, it is found that soon the injection forces its way into 
the cutaneous lymph-sacs of the lower extremities, without, 
however, penetrating into the lymphatics of the skin itself. 
But on the inside of the thigh, next the median line and 
in the neighbourhood of the anus, i. e. in those parts which 
are in the common frog conspicuous by their thickness, owing 
to warty prominences of the cutaneous gland-sacs, a beautiful 
injection appears, which gradually increases in breadth and 
intensity, but does not penetrate anywhere into the lymphatics 
of the ordinary thin skin of the surrounding parts. Asphalt- 
benzole yielded no results. 
30. Looking at the injected skin with the unaided eye 
there appears a beautiful mosaic or network of blue lines, 
each of its meshes corresponding to a wart. Under a lens, 
or, still better, under a low power of the microscope, it is 
ascertained that what with the unaided eye appears as a 
single line of the mosaic is a dense plexus of lymphatics. 
There is a deep plexus of large vessels connected with a 
much denser plexus of fine vessels belonging to the super- 
ficial part of the skin. These latter vessels are of various 
sizes and of a very irregular outline. Fig. 7 shows them 
very well as seen under a higher power. The plexus of the 
finer vessels is interrupted by the cutaneous glands, as is 
noticed in Fig. 7. But there exist special lymphatics sur- 
rounding a smaller or greater section of the circumference of 
the gland-sacs; these latter, viz. the gland-sacs, are shown 
only in outline in this figure. 
The lymphatics destined for the glands are apparently 
terminating with a cecal extremity ; and there are also other 
vessels of the general plexus which appear to terminate in a 
czecal manner in the connective tissue of the skin. 
' Til.—Tue Lympnwatics oF THE ConsUNCTIVA. 
31. According to Schmidt (‘ Die Lymphfollikel d. Binde- 
haut’ Wien, 1871), the lymphatics of the conjunctiva form a 
superficial and deep network connected with one another by 
many short branches. The vessels of the superficial network 
are very fine, and some of them terminate in the tissue with 
a pointed or cecal extremity. The vessels of the deep plexus 
are possessed of valves. The superficial network is densest 
at the limbus, and less dense in the conjunctiva fornicis than 
in the conjunctiva palpebre. 
I have investigated the lymphatics of the eyelids of the 
new-born child and of the rabbit. 
