8o 
Sir Everard Home on the 
Fig. 5. Internal view of a vertical section of the preceding 
figure, bringing to view the inside of the iris with the nigrum 
pigmentum, the ciliary processes, the radiated and pigmented 
circle in the anterior arch of the eye, the retina, and a por- 
tion of the medullary substance of the optic nerve and the 
choroid membrane ; magnified three diameters. 
Fig. 6 . Side view of the vitreous humor and crystalline 
lens, taken out of the eye, to show the impression left on it 
by the pigment of the radiated circle, and ciliary processes ; 
magnified three diameters. 
Fig. 7. External view of the iris, consisting entirely of a 
plexus of vessels; magnified three diameters. 
Fig. 8. Internal view of the iris, consisting of bundles of 
muscular fibres ; those next to the pupil being orbicular, and 
the exterior radiated ; magnified three diameters. 
Plate VII. 
Fig. 1. Internal view of a small portion of the iris of the 
human eye, the pigmentum nigrum being removed to show, 
a, a, the orbicular, and b, b, the radiated muscle; magnified 
ten diameters. 
Fig. 2. Internal view of a portion of the membranous part 
of the human eye, consisting of a, a, a small portion of the 
iris with the pigment ; b, b, the ciliary processes in their natu- 
ral state ; c, c, a portion of the radiated circle in the anterior 
arch of the eye, its pigment appears to have been disturbed 
by the vitreous humor being forcibly removed ; d , d, the 
commencement of the retina, and e, e, the edge of the choroid 
membrane ; magnified ten diameters. 
Fig. 3. External view of the same ; a, a, the iris, b, b , two of 
the ciliary processes, c, c, the seam or ligament by which all 
