DR. MARTIN BARRY ON FIBRE. 
129 
cuius was greater than elsewhere, independently of the presence of the 
filaments (a and /3). In some parts a single transverse filament crossed 
the fasciculus, without being met by one in the opposite direction. 
Fig. 102. Sketches of fasciculi (the “primitive fibres” of authors) in the ischiatic 
nerve. All that is intended by this figure, is to show the breadths of the 
fasciculi, and to give some idea of the direction of such of the contained 
filaments (“ white substance,” par. 28) as are represented, which is by no 
means all that were present in these objects, a and y. Filaments inter- 
lacing. /B. Filaments more longitudinal. In (3, the interior seemed fluid, 
or nearly so. 
Fig. 103. Chick in ovo\ incubated twelve days. Very young muscle-tube in a state 
resembling that in fig. Ill (see the description of fig. 111). The longi- 
tudinal filaments are all represented by dots except one, which is seen on 
its flat surface. The spiral filament is in outline. 
Fig. 104. Sketch of a fasciculus of filaments from mould on a ripe berry. The same 
mould as that in fig. 78. 
Fig. 105. Sheep. Sketch, showing the diameter, and undulating, soft appearance of 
two of the fasciculi in the medullary substance of the cerebrum. In one 
of these, some of the contained filaments are represented. 
Fig. 106. Sheep. Sketch of fasciculi from the cortical substance of the cerebrum, 
wholly composed of filaments. One of these fasciculi, a, is in outline 
only. In the other, j3, filaments are represented ; but these are merely 
dotted in, with one exception, y. These filaments did not appear tense, 
but of the same softness as those from the olfactory nerve, fig. 108. 
S. Division of the fasciculus into two parts. 
Fig. 107- Rabbit. Fasciculus from the optic nerve. It consists of filaments, lying 
loosely together, and less distinctly circumscribed by a membranous in- 
vestment than those of the “ white substance” in, for instance, the ischi- 
atic nerve (par. 32). 
Fig. 108. Rabbit. Fasciculus from the olfactory nerve. See the description of fig. 
107, which is quite as applicable here. The appearance is well repre- 
sented in this figure (par. 32). 
Fig. 109. Sketch of a fasciculus of flax. It represents very few of the filaments seen 
in the interior, a. Membrane at the surface divided at this part. (3. Fila- 
ment having a longitudinal direction. y. Direction of more oblique 
filaments, s. Central body, surrounded apparently by a fluid. In other 
parts of the fasciculus, s was not visible. It appeared to have resolved 
itself into the interlaced filaments Jig. 110; each of the threads in z pro- 
ducing several filaments. 
Fig. 110. Part of the same fasciculus of flax as that in fig. 109. a. Division of an 
investing membrane. In the interior were interlaced, and apparently 
MDCCCXLII. S 
