226 PRACTICAL HISTOLOGY [XXIX 



mount it in glycerine (or take a fresh eye, and mount 

 the cells in salt solution). Observe the single layer of 

 hexagonal cells with large pigment granules. 



DEMONSTRATIONS. 



1. Ciliary processes and iris of rabbit (or of a 

 smaller mammal) with vessels injected, mounted flat 

 with ciliary processes uppermost. 



2. Radial section of anterior part of eye of man. 

 Note the well-developed bundles of the ciliary muscle, 

 passing from the region of the inner anterior part of 

 the sclerotic to the choroid. At the inner and anterior 

 part of the muscle, some transversely cut fibres may 

 be seen (circular muscle). 



3. Vertical section of blind spot ; note the fibres 

 of the optic nerve passing through the layers of the 

 retina to reach the inner surface. 



4. Vertical section through the fovea centralis of 

 man : note the elongation of the cones and the thinning 

 of the other layers. 



5. Sections of retina by Golgi method. 



NOTES. 



Anterior part of the eye. The eye is placed in Flemming's 

 fluid for half-an-hour to an hour, the posterior half is then 

 cut away : the anterior half placed again in Flemming's fluid. 

 When hardened, a cut is made in the suspensory ligament and 

 the lens removed ; the rest is cut in radial pieces, these are 

 stained in bulk, cut in paraffin, the sections approximately 

 parallel with the ciliary processes alone being mounted. 



Lens. The eye of a rabbit or cat, with the cornea and 

 sclerotic cut through, is placed in M tiller's fluid for three weeks 



