STUDIES IN THE RETINA. 359 



inference^ but admits of demonstration, will shortly be shown 

 in another paper. 



EXPLANATION OF PLATES 27—29, 



Illustrating Mr. H. M. Bernard's paper on '' Studies in the 



Retina." 



Ill all the figures m.l.i. =^ membrana limitans interna; m. I. e. = mem- 

 braiia limitans externa; i.r.L = inner reticular layer; o.r.l. = outer reti- 

 cular layer; «./. = nerve-layer; 5. s. = strand of the retinal syncytium; 

 i, p. = blood-vessel. 



Fig. 1. — From the retina of a young cat (Perrenyi). A large ganglionic cell 

 with the cytoplasm filling a syncytial chamber. The " Nissl's SchoUen " 

 clearly connected with the nucleus, and as if arranged as a reticulum through- 

 out the cytoplasm. Cf. Fig. 12 and also Fig. 26. 



Fig. 2. — Retinal ganglionic nuclei, a and c from a rat three years old 

 (Perrenyi), d from a rat four days oldX^lemming's fluid), showing what appear 

 to be small, apparently fragmenting nuclei with hardly any chromatin con- 

 tents, a shows a single mass of granular cytoplasm associated with tliree 

 small nuclei ; c shows a large vesicular nucleus with dispersed chromatin, and 

 near it a contracted nucleus with vacuoles in the i. r. I. Cf. Fig. 3, a and b. 



Fig. 3.— Retinal ganglionic nuclei, a. Rat, three years old (Perrenyi). 

 b, c, d. Young cat (two days) (Perrenyi). (Fig. 25 shows more of the same 

 section as d.) a and b show vesicular and contracted nuclei ; c and d nucle 

 with very scattered chromatin contents, and apparently fragmenting. 



Fig. 4. — From the retina of a salamander (corrosive sublimate). A thin 

 tangential slice of a nucleus of the middle layer, showing the matted branchings 

 of the intra-iiuclear reticulum without any associated cytoplasm or even con- 

 tinuous nuclear membrane. 



Fig. 5. — From the retina of a mouse (Hermann). Ganglionic nuclei, as a 

 rule without granular cytoplasm, most with chromatin protruding, and often 

 as if streaming away. 



Fig. G. — From the retina of a stickleback (Lindsay Johnson's fluid). This 

 figure shows two ganglionic nuclei with their connecting filaments running to 

 the primitive nerve-fibrils seen in the transverse section of the nerve-strand. 

 In this section the nuclear connections could be traced very clearly nearly 

 through the retina (cf. Fig. 17 u, from the same retina). 



