CONTENTS OF VOL. I. XX 
Page. 
2. Sense of Heat. 
Its peculiar characters. Information which it commu- 
nicates. ; : i 17 
3. Sense of Light. 
Structure of the Eye. Coats of the Eye, sclerotica. 
cornea, choroides, ciliary ligament and processes, 
uvea, iris, pigmentum nigrum. Humours of the 
Eye, vitreous, crystalline, and aqueous. Nerves 
of the Eye, Optic nerve, Retina. Muscles of the 
Eye. Glands, lachrymal, Meibomian, and carun- 
cula lachrymalis. Coverings of the Eye, eye-lids, 
nictitating membrane, conjunctiva, eyebrows. Sim- 
ple and compound eyes. : : Wi 
Functions of the Eye. Focus. Why objects are not 
seen inverted. Objects seen at different distances. 
Diurnal and nocturnal Animals. Albinoes. Single 
vision with both eyes. 182 
Knowledge procured by the sense a Sight! Colour 
of bodies, their direction, magnitude, distance, sur- 
face, and motion. Apt to deceive. Painting. 193 
4. Sense of Hearing. 
Structure of the Organ. Internal Ear. Labyrinth, 
auditory nerve, tympanum, Eustachian tube. Ex- 
ternal Ear, concha. . . 199 
Knowledge procured by Hearing. Sound safle « us oF 
the distance, position, and velocity of bodies, even 
their composition. : : : : : 203 
5. Sense of Smell. ™ 
Structure of the Organs. Nose, septum narium, ol- 
factory membrane, nasal mucus, elfactory and nasal 
nerves, Sinuses. : s 206 
Functions of the organ of smell. Odours. Knowledge 
communicated, Useful in selecting food. ‘ 207 
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