JOURNAL OF MICROSCOPICAL SCIENCE. 
DESCRIPTION OF PLATES X, XI, 
Illustrating Mr. Nunneley’s paper on the Structure of the 
Retina. 
PLATE X. 
Fig. : 
1.—Vertical section of human retina, to show the relative position of its ele- 
ments—(plau of). 1, choroid coat ; 2, rods ; 8, outer layer of granular 
cells; 4, indiseinct fibrous layer; 5, inner layer of granular cells, 
in which are imbedded larger vesicular cells, and towards the inner 
surface is found, 6, the vascular layer, which consists of delicate 
vessels derived from the larger branches of the central artery of 
retina, which run on the inner surface of 7, which is the layer 
formed by the fibres of the optic nerve; 8, transparent cells 
attaching the retina to the hyaloid membrane. 
9.—Human rods, x 4:50 linear. 
3.—Rods in various stages of alteration. a@. By the addition of water, or 
after the eye has been in dilute spirit, or a short time after death. 
6. After being treated with dilute chromie acid. ec. After twenty- 
four hours’ immersion in Goadby’s solution. x 450. 
4.—Inmer surface of posterior portion of human retina, to show the 
granular layer with larger circular cells amoagst which the nerve- 
fibres run; to thé left is seen an artery dividing into two branches. 
x 450. ‘ 
5.—Same surface with 1-12 object-glass, and achromatic condenser, x 600, 
without nerve-fibres, to show the clear transparent cells (probably 
enlarged by endosmose), and the cellular character of the so-called 
granular layer, which consists of true cells containing very refractive 
nuclei. 
6.—Nerve- fibres from posterior part of human retina; they appear to 
bifureate and to join each other again. x 450. 
7.—Ilvregular fiat cells found in the eyes of most, if not ail, animals. 
a. Krom human feetus. 6. From pig. ¢. From sheep. d. From 
bullock. Alijust dead. x 450. Are they caudate gangliform cells ? 
8.—Turkey. @. Conoidal rods surmounted by coloured globules. 6. 
Coloured globules of various sizes detached. ¢. Cylindrical rods. 
d. Qvoid bodies with coloured globules. x 450. ¥ 
9.—Retina of birds. @. Conoidal rod with coloured globule from canary 
bird. 6. Conoidal rods with ecloured globules from various breeds of 
domestic fowls; in the same bird the size and exact shape varies, 
perhaps, at least to some extent, depending upon varying pressure 
against each other. ¢. Cylindrical rods not surmounted by coloured 
globules. d. Ovoid bodies (bulbs, cones) with coloured globules. 
e. Coloured globules seen on outer surface of retina as though with 
anucleus, which they do not possess. / Coloured globules seen in 
