474 
UR. E. KLEIN. 
filially, that they anastomose, in a few instances, with their 
neighbours. 
These fibrils differ in thickness, and they all contain small 
or large varicosities, more or less regularly disposed. I must 
draw the attention of the reader to figs. 4 and 4a, and 5, 
in which the nature and course of these fibres is drawn very 
accurately. In what way do they terminate ? As is well 
shown in the figures, after having given off one or more 
branches, they, as well as their branches, appear to terminate 
freely either at a varicosity or beyond it, at the side of a 
corneal corpuscle. In this respect I can add little to the 
description given by Hoyer of these fibrils with admirable 
faithfulness. 
In the cornea of the frog these fibrils are much more diffi- 
cult to trace, since their great number is compressed into the 
posterior strata of the substantia propria, that is, into a very 
limited space. For this reason we find that anastomoses 
between neighbouring fibrils are more common than in the 
cornea of the rabbit and kitten. 
I possess specimens both of the cornea of the rabbi t and kitten, 
and also of that of the frog, wherein I find places in Avhich 
these fibrils, when examined with a high power (Zeiss’ F, or, 
still better, oil immersion off ’^'ory minute short 
fibrils, which close to the surface of the body of the corneal 
corpuscles give off short, exceedingly fine, dotted fibrils, which 
themselves are connected into a network. It is, of course, 
easily understood, that in many instances it is impossible to 
distinguish between dots that are contained in the substance 
of the corneal corpuscles and the dots that mark these ter- 
minal fibrils ; but in certain other instances this distinction 
is possible, viz. in those instances in which the corneal cor- 
puscles and their processes are stained only a greyish tint, lohile 
the nerve-fihrils and their varicosities, owing to the complete 
reduction of the gold salt, possess an almost black colour. 
In some specimens, however, we find also nerve-fibrils 
in connection with the processes of a corneal corpuscle, such as 
is described by Moseley, Kouigstein, and Izquierdo, and there 
seems no mistake about the nerve-fibrils being here directly 
continuous "with a corneal corpuscle. But let us for a moment 
inquire. What are these specimens? As is known to everybody 
who has examined a number of cornem, either prepared 
after the simple (Uohnheini) method of chloride of gold, or, 
in addition to this, after using various reducing agencies, 
such as oxalic acid, formic acid, methylated spirit, or simple 
heat, hardly a single cornea is obtained in which the sub- 
stantia propria appears throughout of the same tint. In 
