120 DR. MARTIN BARRY ON FIBRE. 



far advanced ; (3. the outer part is formed, nucleus double (pars. 98^, 99) ; 



y. no part of the filament yet formed ; but discs are arranged in aline for 



its formation (par. 25). 

 Fig. 14. Lobster (Cancer marinus, LINN.). Sketch of blood-corpuscles, each of which 



has become a coiled filament (par. 4). a. Structure of the filament (par. 



6). At (3 the filament is on its edge. 

 Fig. 15. Oyster (Ostrea edulis, LINN.). Sketch of blood-corpuscles, each of which 



has become a coiled filament (par. 4). At certain parts the figure re- 

 presents the structure of the filament (par. 6). 



PLATE VI. 



Fig. 16. Rabbit (Lepus Cuniculus, LINN.). Sketch of blood-vessels in the pia mater 

 a. Longitudinal filaments, merely dotted in, except that on the left, 

 which represents the structure of the filament (par. 6). |8. Outline of a 

 filament spirally investing the longitudinal filaments, y. Structure of 

 this filament. 5. Blood-corpuscles, chiefly young and of very minute size. 

 t. Line marking the situation of the inner surface of the vessel (par. 64). 



Fig. 17. Rabbit. From the spinal chord. Corpuscles, apparently young blood-cor- 

 puscles (a), passing into a compound disc (j3), out of which there is formed 

 either a ring (y) or a coil (5). The larger coils ^, e, seemed to be advanced 

 conditions of y and 5. Colour red (par. 34). 



Fig. 18. Rabbit. Sketch of bodies observed in the retina. The general appearance 

 of such bodies is that of rings, having a very high refractive power (" glo- 

 bules" of authors ?). But they are coiled filaments, often seen to be formed 

 out of rings such as those in fig. 17. Such objects are red (par. 34). 



Fig. 19. Rabbit. From the medullary substance of the brain. Ring-like object or 

 coil, connected, certainly at a and probably at (3, with a filament, the 

 structure of which is seen at y. Blood-red (par. 34). 



Fig. 20. Sheep (Ovis Aries, LINN.). From the grey substance of the cerebellum. 

 Sketch of coils, which are altered discs, such as (3 fig. 17 (par. 34). 



Fig. 21. Sheep. From the spinal chord -f-. Coils, arisen out of discs having the ap- 

 pearance of blood-corpuscles, a Was lying on /3, and apparently enter- 

 ing, with it, into the formation of a tube (see pars. 34. 35). y. Structure 

 of the coiled filaments. 



Fig. 22. Sheep. From the spinal chord -j-. Objects such as those in fig. 21 having 

 united to form a tube (a), other spirals come into view in the interior 

 (which indeed are represented in fig. 21). The continually renewed nu- 

 clei, unwinding themselves, first in one direction and then in the other, 

 give origin to coils, the adjacent extremities of which unite, and then form 

 t White substance from the interspace between the posterior and lateral tracts. 



