TO THE ELEMENTAET FIBEES OF STEIPED MUSCLE. 
619 
Fig. 4. 
Fig. 5. 
Fig. 6. 
Fig. 7. 
Fig. 8. 
Fig. 9. 
Fig. 10. 
Fig. 11. 
Fig. 12. 
Fig. 13. 
Fig. 14. 
Fig. 15. 
Fig. 16. 
Fig. 17. 
Small portion of a nerve, also from the tongue of the frog, showing several fibres 
contained in the same transparent tissue. 
Portion of a muscular fibre fi’om_ the diaphragm of the mouse, showing nerve- 
fibres and capillary vessels. Below a is seen a fibre connected with the 
nucleus close to the capillary wall, but of the nature of this and of several 
similar fibres I have observed in connexion with the capillary walls, I am not 
certain. Oval bodies are seen apparently in the capillary walls, and also 
external to them. Some would refer the latter to the vascular nerves, and 
many appearances I have observed, some of which are delineated in my draw- 
ings, favour the idea that capillaries, as well as the small arteries, are supplied 
with nerves; but I am not yet able to express a positive opinion on this 
question. 
From the diaphragm of the mouse, showing the manner in which the finer 
bundles di\dde and traverse the elementary fibres in all directions. The inti- 
mate relation of the nerves to the capillaries is also shown in this drawing. 
In nature there is a delicate tissue connecting these structures together, so 
that they may be readily stripped off from the elementary fibre without 
injuring the latter. 
Portion of thin elementary fibres more highly magnified. At a, one of the oval 
bodies in process of subdiwsion is shown. 
Another portion, showing how rhe nerves vary in diameter in different parts. 
In the upper part of the drawing four large nuclei are seen close together. 
Two oval nuclei outside a capillary connected together by a fibre, with two nerve- 
fibres crossing a muscular fibre. 
A portion of a wide muscular fibre from the diaphragm of the mouse in a state 
of contraction. The nerve-fibre in the upper part is seen to divide. 
Fine nerve-fibre from the diaphragm of the mouse, under x o;o o i^^h in 
diameter, but consisting of two, if not of three or more fibres. 
Another appearance frequently observed. 
Branching of very fine nerve-fibres from the tongue of the mouse. 
From the diaphragm of the mouse, showing the nerve-fibres between two 
elementary fibres of muscle. 
Also from the diaphragm, showing a portion of a muscular fibre nearly covered 
with nerves. Such specimens were common. 
Manner in which the oval bodies subdivide. 
Portion of a nerve-fibre undergoing increase in its length by the transverse 
division of the nucleus. From the surface of a muscular fibre from the 
diaphragm of the mouse. 
4 M 2 
