DR. MARTIN BARRY ON FIBRE. 
95 
the remarkable arrangement of the two lines of ring’s at «. For, during' the transi- 
tion (as 1 suppose) of the rings into coils, an interlacement is almost a necessary con- 
sequence of the alternate succession of the rings. I have also seen this interlacement 
of spirals provided for, apparently, by the rings of several lines being linked together 
while still rings (fig. 47 : see also fig. 120). 
24. Figure 48, from its exhibiting only one side of the tube, represents but two rows 
of rings. The number of rows, however, contained in the tube seemed four: which 
of course would become connected in the above way, as easily as two ; and give 
origin to a corresponding number of interlacing spirals. 
25. I cannot suppose that minuteness is any hindrance to the smallest filament 
(“ fibre”) having its origin by the same mode : and to this, the linear arrangement of 
the discs within the blood-corpuscle seems to have especial reference T- Facts will be 
hereafter mentioned, which seem to show a fasciculus of filaments to be thus produced 
in a certain tissue (par. 42 — 44). 
26. Within the windings of the spirals (fig. 5 7 a), nuclei are sometimes to be dis- 
cerned. It appears to be from these nuclei that there proceeds the substance for 
forming new filaments (fig. 22) ; which are very often seen within the winds of spirals 
(figs. 131 (3, 94, 58). 
2 7. I have in some instances observed the filaments, when enlarging, to present a 
remarkable change in the relative position of their spiral threads. If figs. 40, 41 be 
referred to, it will be seen that a of fig. 40 passes into a of fig. 41, and the latter into 
f 3 of the same figure. The scheme fig. 60 may illustrate this transition. This scheme 
is merely an altered state of that in fig. 55. In each there are two spirals ; the dif- 
ference consisting in the relative position of the spirals. The points in contact at a 
fig. 55, have separated in fig. 60 (a, u) ; so that now, a transverse section is no longer 
represented by the figure 8 (par. 14), but by a circle. This latter (fig. 60) seems 
to exhibit the relative position of the spirals, in some instances, when they begin to 
form, as will be hereafter shown, the membrane of a tube. Such appears to be then- 
state in fig. 41. (3 : a state which apparently precedes the formation of the tubes in 
figs. 42, 43, and the subsequent figures in this Plate. 
Facts observed in the Formation and Structure of Nerve. 
28. It is known that in the so-called “ primitive fibres” into which a nerve can be 
separated by means of needles, Remak demonstrated a “ band-like axis],” corre- 
sponding to the “ cylindrical axis of Purkinje];” and that the substance surround- 
ing this axis, has been termed by Schwann, the “ white substance of the nervous 
fibre]:.” This “ white substance” I find to consist of filaments (fig. 112 a, {3 — fig. 
t See my Part III. on the Corpuscles of the Blood, Philosophical Transactions, 1841, Plate XVIII. 
figs. 52 y, 54 s. 
t Muller’s Elements of Physiology, translated by Dr. Baly, Part VI. p. 1649. 
