03, 409.

Idiots, who are, in law, 151.
Condition of, 304.
May be educated, 300, 307.

Ignorance, its effects considered, 230.
Of the correct treatment of children, 133.
Man in a state of, 311.

Indians never have consumption, 109.
Anecdote of an, 203, 225.

Indigestion caused by mental anxiety, 137.

Inhaling tubes, their use considered, 109, 110.

Insanity, how caused, 126, 138, 308, 409.

Instruction, modes of, extensively practiced, 425.

Insurance of property, the best modes of, 266, 267.

Intellectual education, its nature, 111.

Intemperance, hereditary, 41, 42.
A cause of idiocy, 302.
Expense of, in this country, 358, 360.
See _Breath_.

Intermarriages, influence of, on posterity, 115.

Irritability of teachers accounted for, 120.

Juvenile delinquents, provisions for, 449, 450.

Knowledge essential to prosperity in agriculture, 269.
Required in the useful arts, 272.
See _Education_.

Labor, education increases the productiveness of, 253.
During rapid growth often injurious, 68.
Of females in factories and in the domestic employments of the sex,
268, 279.

Ladies in France, consequences of their erect posture, 71.

Lardner, Dr., on popular fallacies, 246, 248.

Laura Bridgman, the deaf, dumb, and blind girl, 148.

Library and apparatus, 398. Township and district libraries, 399.

Life, extensive loss of, how caused, 298.

Lunacy, origin and signification of, 251, 252.

Lunar influences considered, 250.

Lungs strengthened by reading aloud and singing, 79, 80.
Blood changed in the, 85.
Exhalations from the, 86.
Absorption in the, 87.
Diseases of the, hereditary, 87.
Exercise of the, a means of preventing disease, 105.
When they should not be exercised, 107.

Lyceums in districts, how rendered popular and useful, 400.

Mann, Hon. Horace, referred to and quoted, 257, 328.

Manufactories, to be productive, require educated workmen, 261-269.
Education of children employed in, 278.

Marriage of relatives a cause of consumption, 126.
A cause of idiocy, 303, 304.

Mastication, importance of, to digestion, 48.

Masturbation, 409.
See _Secret Vice_.

Meals, proper time for partaking of, 55.

Measures, a system of, for schools, 188, 404.

Mills, James K., testimony of, in relation to education and labor, 261.

Mind, laws of, 111, 112.
See _Brain_.

Moral educat