Nerves to the Skin of the Frog, 
23 
This fact appears to me to prove^ that from the branches 
forming the network some very few branches arise which pass 
on and tend to reach the outer layer of the derma. Indeed^ 
I have distinctly seen in the latter situation some of these fine 
branches, which, on being traced as far as the capillary network^ 
I have observed them still further dividing, and the resulting 
branches to be distributed partly to the capillaries, and partly 
to some of those follicular glands which are found under- 
neath the capillary network. The fine nerve-fibres in ques- 
tion are easily distinguished from the dark-bordered fibres^ 
until the latter preserve their structure unchanged. But 
when they, by loosing the white substance, become pale 
fibres, it must be confessed that such distinction is accom- 
panied with great difficulty. The difficulty is exceedingly 
increased by the circumstance, that both kinds of nerve-fibres_, 
as they approximate towards the surface of the derma, blend 
together and form bundles, in which the individual fibres are 
so close that they can hardly be discerned from one another. 
Nevertheless, I think that, if we look diligently at those 
spindle-shaped swellings which the fine fibres imbedded in 
the sheath of the dark- coloured fibres present_, at inequal 
intervals, and also at their ultimate distribution, we may pos- 
sibly arrive to a distinction between these two kinds of nerve- 
fibres. Because as I have already stated, in the outer layer 
of the derma, the fine nerve-fibres accompanying the dark- 
bordered ones are almost exclusively distributed to the capil- 
laries and glands. 
In my paper on the nerves of the cornea, which has been 
already published in the ^Transactions of the Society,^ I believe 
I have proved against Kiihne^s opinion that, between the finest 
nerve-fibres and the cornea-corpuscles, there is no other rela- 
tion than that of contiguity. In confirmation of my former 
statement, I now wish to draw attention to the description I 
have just given of the manner in which the nerve-fibres are 
arranged in the middle layer of the derma of the frog, because 
there exists some similarity between it and the corneal tissue. 
In fact, both contain a large number of nucleated corpuscles, 
with several branched anastomosing processes, and both are 
supplied with pale nerve-fibres^ But in the middle layer of the 
derma of the frog the nerve-fibres and the nucleated corpuscles 
are far less numerous. I deem this circumstance very favor- 
able for investigating what relation the former bear to the 
latter. Now I can positively state, that, notwithstanding 
that I have several times succeeded in following fine nerve- 
fibres for a very long distance through this fibrous layer, I 
have never been able to discern any of them to enter into con-. 
