TO THE ELEMENTARY FIBRES OF STRIPED MUSCLE. 
907 
ExPLAJfATION OF THE PlATES. 
The figures represented have been copied from specimens magnified mth a twelfth 
(700 diameters linear) and a twenty-sixth (1700 diameters linear), made by Messrs. 
Powell and Lealahd. All the figures, with the exception of figs. 1, 2, 3, 4, & 5, have been 
carefully copied from nature. The relative sizes of the objects represented have been 
accurately retained. The dimensions of every object can be ascertained by measuring it 
upon one or other of the following scales ; so that in the text I have considered it super- 
fluous to insert the measurements. 
Many of the specimens will retain their characters for some time (probably two or 
three years at least), and can be examined by any one desirous of seeing them. Some of 
the drawings were traced from my drawings, on the wood blocks, under my immediate 
direction, others by myself. They were engraved by Miss Powell. 
1000th I 1 X700 
1000th I 1 X1700 
PLATE XLI. 
Fig. 1. Terminal fibres beneath the sarcolemma, copied fi:om Kuhhe’s paper. The fibre is 
as broad as the nucleus, appears smooth, and terminates in a pointed extremity. 
Fig. 2. Fine fibres with nuclei, as seen in many tissues of the frog, according to the 
author’s observations. The fine fibres delineated are less than the E-^A—th 
of an inch in diameter, and often become so fine that they cannot be followed ; 
but the apparent terminations are not true ends. 
Fig. 3 illustrates the manner in which fine nerve-fibres with nuclei ramify at their 
distribution, a. A nucleus with a fibre passing from either extremity; h, 
fine neiwe-fibre branching ; c, two fibres running parallel to each other. 
Fig. 4. Fine nerve-fibres dividing at the points a a, where they meet another fibre, into 
two branches, which pursue opposite directions. 
Fig. 5. Network of nerve-fibres to show how the finest fibres might possibly terminate 
in free extremities or in nuclei, consistently with the existence of networks 
demonstrated by the author. 
Fig. 6. Network of nerve-fibres near the inner surface of the bladder of the frog ; each 
fibre is composed of a number of very minute fibres, which do not anastomose 
with each other. A dark-bordered fibre was continuous with the fibres of 
which this network is composed, at a point a little below the lowest fibre 
represented in the drawing. Xl700. 
Fig. 7. ‘ Termination ’ of a dark-bordered fibre, showing its continuity with fine fibres 
arranged to form networks as in fig. 6. A fine fibre {a) is seen to run parallel 
with the terminal part of the dark-bordered fibre {b). This is also lost among 
other fibres of the network. The granular appearance of the fibres in this 
6 H 2 
