Nerves to the Skin of the Frog, 
31 
of the dark-bordered fibres^ and partly belong to the fine 
fibres imbedded in the sheath of the dark-bordered fibres. 
The very terminal portion of the plexus lies immediately be- 
neath the capillary network of the outer layer of the derma. 
3. The fine nerve-fibres existing in the same sheath with the 
dark-bordered fibres^ neither in refractive power,, nor in the 
manner in which they comport themselves with the chemical 
agentSj nor in the appearances of those spindle-shaped 
swellings^ which they present at intervals^ differ from the 
nerve-fibres accompanying the capillary vessels. 
4. The fine nerve-fibres running in the same sheath with 
the dark-bordered fibres are distributed to the capillaries^ the 
connective tissues^ and the numerous glands which exist in 
the outer layer of the derma. 
5. No dark-bordered fibre is distributed to the middle 
layer of the derma. It is only supplied with fine bundles 
consisting wholly of the fine nerve-fibres which are contained 
in the same sheath with the dark-bordered fibres. 
6. The fine nerve-fibres accompanying the capillary vessels 
for the greater part arise from those imbedded in the sheath 
of the dark- bordered fibres. 
7. The fine nerve-fibres which are found in company with 
the dark-bordered fibres at the periphery are not a prolonga- 
tion of the latter. They are derived from ganglionic cells. 
8. Finally;, in the skin of the frog^ neither the dark-bordered 
fibres^ nor the fine fibres in the sheath of the dark-bordered 
fibres^ or in company with the capillary vessels^ end in free 
extremities. They always^ in their ultimate distribution^ 
form networks or plexus, consisting of very fine bundles, con- 
nected, at irregular distances, with some small bodies of an 
oval, triangular, or some other shapes. 
