DR. MARTIN BARRY ON FIBRE. 129 



cnlus 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. |8. 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, /3, 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, e. Central body, surrounded apparently by a fluid. In other 

 parts of the fasciculus, e was not visible. It appeared to have resolved 

 itself into the interlaced Jilaments Jig. 110; each of the threads in & pro- 

 ducing several Jilaments. 



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 



