132 DR. MARTIN BARRY ON FIBRE. 



face of the hair. y. Structure of the filaments, and frequent position with 

 reference to the surface. The dots show merely the direction of other of 

 the filaments : this direction being spiral. Their distance from one an- 

 other is different in different hairs. A similar appearance observed in 

 hairs from the under surface of the leaf and from the stem (par. 72). 

 Fig. 129. Fretal Sheep. From the crystalline lens. Sketch of tubes containing discs. 



A space in the middle of the tubes (see par. 61). 



Fig. 130. Chick in ovo ; incubated fifteen days. From the crystalline lens. Chiefly in 

 outline, a. Composed of filaments, two of which are represented in the 

 figure. |3. An object composed of filaments, more of which were present 

 on the right hand than on the left ; whence the greater thickness at the 

 former part. The arrow indicates the longitudinal direction of these 

 filaments. At one end of this object (/3) are pendent portions, not of 

 entire filaments, but of spiral threads composing filaments ; these spiral 

 threads hanging from the extremities of certain filaments where broken 

 off. y. Portion of a fasciculus of filaments containing a nucleus, which 

 displaces the contiguous filaments. Many such fasciculi are seen in fig. 

 132. In the nucleus are three discs, with an orifice in each. 



Fig. 131. Bream. From the central part of the crystalline lens. a. Two spirals run- 

 ning in opposite directions, the one within the other. /3. Two interlaced 

 spirals containing filaments, y. Two interlaced spirals. 5. Filament en- 

 larging. Certain states of filaments pass into the toothed fibre, discovered 

 by Sir DAVID BREWSTER (see par. 62). 



Fig. 132. Chick in ovo ; incubated fifteen days. From a more central part of the same 

 lens, as that from which fig. 130 was taken. Sketch of a flat object, 

 folded at |3. It was composed of fasciculi, y, resembling y of fig. 130. 

 These fasciculi consisted of filaments, among which were nuclei, displa- 

 cing, as at a, the contiguous filaments. 

 Figs. 133 to 136. Rabbit. From the cartilage of the ear. 



Fig. 133. This figure represents in outline the situations of several cells. The 

 nuclei of these cells are not shown in all of them. In one instance, 

 a, the nucleus resembles a ball of twine (see par. 18). ft. Some of 

 the filaments of the intercellular substance. The nucleus frequently 

 elliptical in form. 



Fig. 134. Cell, for the most part in outline. The walls composed of interlaced 

 filaments, a. Structure of the filaments. The central portion of the 

 nucleus had divided into two parts (centres), held together in a 

 remarkable manner by interlaced filaments, proceeding from these 

 parts. Possibly this division of the nucleus denotes incipient divi- 

 sion of the cell into two minuter cells. Each of the two parts 

 (centres) of the nucleus had its orifice (" nucleolus ") ; the two orifices 



