LYMPHATIC SYSTEM OF SKIN AND MUCOUS MEMBRANES, 385 
sections, after staining, are treated in the usual way for 
mounting in balsam or dammar, viz. they are placed in abso- 
lute alcohol, and then in oil of cloves, where they obtain the 
desired transparency. ‘The section having been lifted out of 
the oil of cloves and the excess of the latter having been 
allowed to run off, is mounted in glycerine jelly. For the 
first month or two the lymphatics retain the asphalt in its 
original (black) state, but this becoming partly dissolved the 
vessels appear then filled with a paler (yellowish-brown) 
material. After several months tne material still more 
fades into a transparent yellow, but the vessels remain 
nevertheless distinct. 
In isolated cases I have been able to preserve some of the 
asphalt injection, of course only in a faint brown colour, in 
the lymphatics of the skin of the new-born child, even in 
sections mounted in Canada balsam solution. 
10. It is hardly necessary specially to add that in the 
examination of sections, both through the injected skin and 
mucous membranes, only such parts have been selected that 
are at some distance from the point of ‘ puncture,” so that 
artificial extravasations may be excluded. 
In the description of the lymphatics of the connective- 
tissue ground substance of the skin we shall take first those 
of man. 
11. In a vertical section through the skin, e.g. of the 
hand or foot, scalp, or of the face, whose lymphatics appear 
well injected, most of these present themselves cut trans- 
versely or obliquely This would of course indicate that 
most of them possess a more or less horizontal direction, 
z.e. parallel with the surface. ‘There are, however, connect- 
ing vessels to be seen in all layers which run for a shorter 
or longer distance a longitudinal course. rom the papil- 
lary body down to the layer of the adipose tissue the connec- 
tive-tissue of the skin in a vertical section appears uniformly 
pervaded by these lymphatics, except of course where it is 
interrupted by the presence of the hair-follicles, se baceous 
glands, and sweat glands; a distinction into a superficial 
and deep stratum, as maintained by the other observers, 
cannot be well maintained. 
12. J. Neumann, in his above-quoted memoir, gives in 
fig. 1, plate i, an illustration of continuous plexuses of 
lymphatics in a vertical section through the skin of the 
finger ofthe new-born. Such appearances, viz. a continuous 
plexus of lymphatics in a vertical section, I have not met 
with in any preparation of the skin in either man or mammal, 
and I doubt whether Neumann’s figure is drawn from an 
