DR. BEALE, ON NERVE-FIBRES AND CELLS. 105 
in every part of the mucous membrane, and amongst the 
bundles of the muscular fibre-cells. x 700. 
Prep. 29.—Ultimate distribution of the nerves to the 
muscles of the leg of Hydrophilus piceus. In the specimen 
some very fine bundles of nerve-fibres are observed crossing 
in different ways the muscular fibres, and passing from one 
fibre to others. The nerve-fibres of each bundle frequently 
join together, and form a very fine network over the sarco- 
lemma. No connection can be demonstrated between the 
rows of nuclei in the contractile tissue and the nerve-fibres. 
The direction of the rows of nuclei is parallel to that of mus- 
cular fibres, while the nerve-fibres cross the muscular fibres 
either obliquely or transversely. It is beyond all doubt that 
the rows of nuclei delineated by Kiihne, and stated by him 
to be connected with the terminal nerve-fibres, are nothing 
but the nuclei of the muscular fibre itself, which are imbedded 
in the contractile substance, and which take part in its for- 
mation. x 700. 
Prep. 30.—Muscular fibres from the human heart. The 
nuclei, surrounded by granular matter, are seen in the centre 
of the fibres, The mode of growth of muscular fibre from the 
centre to the circumference is clearly demonstrated. Nerve- 
fibres and vessels, with their nuclei, may be also observed. 
We must recall to mind that in insects many muscles have 
central nuclei. x 180. 
Prep. 31.—Shows the ultimate distribution of nerves to 
the cutaneous breast muscle of the frog. Several fine bundles 
of nerve-fibres are seen passing in different directions over 
the muscular fibres, and forming, after dividing and subdi- 
viding, a network with large meshes. Some of the muscular 
fibres, being in a state of contraction, prove conclusively that 
the nerve-fibres do not pass through the sarcolemma. Not 
one of the oval bodies described by Kiihne as the peculiar 
organs in which every nerve-fibre ends beneath the sarco- 
lemma can be seen. Only some nuclei are seen in connection 
with the nerve-fibre of the network. The termination of the 
nerve-fibres in free extremities, as has been stated by Kolliker, 
is also not observed. We must, however, say that some very 
fine nerve-fibres, after having been traced over the muscular 
fibres for a great distance, are at last lost sight of; but these 
may be followed for much greater distance from the dark- 
bordered fibre than the point at which Kolliker’s fibres ter- 
minate. x 700. 
