17 
between all the important tissues which are found in it. 
This is proved by the fact that the vessel is moved when the 
transparent connective tissue at some distance from it is drawn 
in a direction from the vessel. 
The most interesting point I have observed in connection 
with the anatomy of these vessels is the existence of very fine 
nerve-fibres. These form a lax network around the capillary. 
I have traced these fine fibres continuous with undoubted 
nerve-trunks in many instances, and have followed the latter 
into the trunks of dark-bordered fibres, from which the 
bundle in the papilla is derived. A similar arrangement of 
fine nerve-fibres has been demonstrated in connection with 
other capillary vessels of the frog. These fine nerve-fibres 
are very distinct in several of my specimens. 
I have indeed observed, in my paper published in the 
‘Phil. Trans.’ for 1863, contrary to the statements of most 
anatomists, that capillary vessels generally are freely supplied 
with nerves, but the latter and their nuclei have been re- 
garded as connective-tissue fibres and connective-tissue cor- 
puscles ; I have shown in certain specimens that, of the two 
fibres resulting from the subdivision of a dark-bordered fibre, 
one was distributed to the fibres of voluntary muscle, while 
the other ramified over the vessels supplying the muscle 
(PI. Ill, fig. 15). These facts, it need scarcely be said, are of 
great importance with reference to determining the structure 
of the mechanism concerned in nervous action. 
I have not succeeded in demonstrating lymphatic vessels in 
the papillae of the frog’s tongue. 
Besides the various nuclei described, there are several 
round, oval, and variously shaped bodies, about the size of a 
frog’s blood-corpuscle, which are composed principally of 
minute oil-globules and granules. These are not coloured by 
carmine. Many contain a small mass of germinal matter 
(nucleus) in the centre, which is, of course, coloured. In 
some of the smaller ones this mass of germinal matter is 
much larger in proportion to the entire “ cell.” These bodies 
resemble many of the fat-cells of the frog, and I think it pro- 
bable they are of this nature. It is, however, possible that 
these masses may be altered lymph-corpuscles. The Hylse 
which I examined had been for some time in confinement, 
and contained very little adipose tissue. 
Conclusions. 
1. That fine nerve-fibres ramify in the connective tissue of 
which the simple papilla; are composed, and that connected 
VOL. IX. NEW SER. B 
