BOTANIC PHYSICIAN. 
exercise sense and motion ; how thi will is conveyed from the. 
_ to the different parts, and how, from the different parts, sensa 
are conveyed to the brain, remains yet, perhaps, involved in obs 
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=. os + , sit THE EYE. ss gate 
parts which form the eye, are diyided into external and 
. The external parts are the eyebrows, eyelids, eyelas 
the tear gland, the little fleshy excrescence, between the eyelids 
_ the inner angle ; the tear points, two small openings on the nasal 
extremity of each eyelash ; the tear canal, formed by the union of 
the ducts leading from the tear points, which meet and constitute 
at the internal angle of the eye; the tear sac, a dilatation of the teat 
canal, and which ends in the nasal duct, a continuation of the same 
_ canal, which conveys the* tears into the nose; the muscles of the 
eyelids; the muscles of the bulb of the eye, and the fat of the orb 
The bulb, or ball of the eye, consists of eight membranes, two 
chambers, and three hnmors. The ball is covered on the fore part 
by Gn exquisite sensible and delicate membrane, which begins from 
__ the edge of the eyelash, and is reflected over the eye to the edge of 
- the other eyelash. This membrane is the seat of inflammations of 
_ of the eye, and is called the joining coat. Membranes. 1. The 
hard coat, which is white, and the outermost. 2. The enclosing 
__ membrane; which is very strong, and whose vessels run to the cel 
tre. 3. The retina, or fine net, which is innermost. 4, ‘The spider's 
web, which includes the glassy humor. In the front part, are, 5. 
The transparent cornea, which isa part of the head coat. 6. 
__ iris, a part of the enclosing membrane : it is of various colors ; hence, 
~ nal orbital, the central, and the optic, The ¥ 
themselves into the external jugulars. Nerves, the opti¢, OF 
wand branches from the third, fourth, fifth, and sixth pai 
THE EAR. 
soft parts which form the ear ivided ant wit 
a" ve ear, are divided into external and ~ 
> nace > steely at soft parts ar e, the ear, in which are various — 
Ss sails ; the outer-hearing canal, and membranes of 
in ee _ parts are, the common bone men 
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