470 
DR. E. KLEIN. 
as Waldeyer confirms, that there exist two modes of termina- 
tion — one with end-knobs, and the other without. 
What is, then, their real termination ? 
In preparations which would pass the muster of good 
nerve preparations, there is nothing to be seen, even when 
examined with a high power, beyond the fibrils as figured 
by Cohnheim, myself, Hoyer, and Izquierdo, and as now re- 
presented in the figures of the Plate accompanying this present 
memoir. But after they have been kept mounted in glycerine 
for some time — I refer here to specimens of the rabbit’s cornea 
prepared after the simple (Cohnheim’s) method of chloride 
of gold, as well as that where afterwards a' reduction is 
effected by means of tartaric acid (see my former paper in 
this Journal) and mounted in glycerine for one or two years 
— and if they are then carefully examined, it will be found 
that in some of them a great many exceedingly fine fibrils 
are seen, which are given off by the above ordinary intra- 
epithelial fibrils, both as lateral branchlets and from the 
knobs that previously appeared as end-knobs. These 
fibrils, which at the time the preparation was mounted 
could not be seen, are now distinctly traceable, some 
for a long, others only for a short distance. In some 
places they appear as a row of minute stained dots with 
unstained joints between, while in^ others both the dots 
and joints are stained and then easily perceived. Fol- 
lowing under a high power, e. g. Zeiss’ oil immersion 
which by its exquisitely fine definition is admirably suited 
for this purpose, one of the fibrils in the superficial layers — 
of course, only thin horizontal sections of the epithelium 
being referred to here — we are at once struck by the very 
great number of short lateral rod-like projections which are 
seen on most fibrils ^ both the ordinary ones as well as the very 
fine ones just mentioned. Generally, but not by any means 
always, they are given off at the varicosities. Especially 
interesting are, in this respect, the knobs which were above 
referred to as end-knobs ; some of these appear beset with 
these projections on their whole circumference, and resemble, 
then, somewhat the thick extremity of a stamen with its 
radicles. Most of them are very short, rod-like, others can 
be traced for long distances, and in this case they are in- 
variably dotted, and present themselves as regularly varicose 
fibrils, giving off likewise numerous lateral branchlets. Also 
in this case, either only the varicosities appear stained and the 
joints unstained, or the joints are faintly stained. Now, both 
the short rod-like as well as the longer filamentous branchlets, 
ramifying dendritically and uniting by their branchlets. 
