Part 102

Hemisphere, 92, 100.

Herschel, 85.

Hydraulics, 118.

Hydrometer, 128.

Hydrostatics, 118.

Image on the retina, 165, 172. reversed, 167. in plain mirror, 172. in concave do. 175. in convex do. 175.

Impenetrability, 10.

Inclined plane, 54, 66.

Inertia, 10, 14, 32.

Inherent properties, 10.

Juno, 84.

Jupiter, 85.

Lake, 133, 135.

Latitude, 94, 112.

Lens, 184. concave, 184. convex, 184. meniscus, 184. plano-concave, 184. plano-convex, 184.

Lever, 54, 55. first kind, 58. second kind, 60. third kind, 60.

Light, 157. pencil of, 158. of the moon, 162, 163. absorption of, 188. reflected, 160. refraction of, 179.

Liquids, 118.

Longitude, 94, 112.

Luminous bodies, 157.

Lunar month, 108. eclipse, 110.

Machine, 54, 66.

Magic lanthorn, 203.

Mars, 84.

Matter, 10, 13.

Mechanics, 32.

Mediums, 157, 180.

Melody, 156.