5. N. rustica.—­The common green or English tobacco, an annual
    plant, native of America, producing white flowers, which seldom
    grows higher than three feet.

    6. N. paniculata, or panicled tobacco, an annual plant bearing
    greenish yellow flowers, native of Peru, rises to the height of
    three feet.

    7. N. glutinosa, or clammy-leaved tobacco, also an annual plant,
    native of Peru, growing to the height of four feet, with bright
    scarlet flowers.

    8. N. plumbaginifolia, or curled-leaved tobacco, an ornamental
    deciduous annual, native of America, with white blossoms, rising to
    the height of two feet.

    9. N. pusilla, or primrose-leaved tobacco, an ornamental deciduous
    biennial, with white flowers, native of Vera Cruz, rising to three
    feet.

    10. N. quadrivalvis, four-valved, or Missouri tobacco, an
    ornamental annual, native of North America, with white flowers,
    seldom growing higher than two feet.

    11. N. nana, or rocky mount tobacco, a curious greenhouse annual,
    native of North America, with white blossoms, rising only three
    inches high.

    12. N.  Langsdorffii, or Langsdorff’s tobacco, an ornamental
    annual, with greenish yellow flowers, native of Chili, reaching five
    feet high.

    13. N. cerinthoides, or honey-wort tobacco, an ornamental annual,
    with greenish yellow flowers, native country unknown.

    14. N. repanda, or Havanna tobacco, an annual with white flowers,
    native of Cuba, rising two feet high.

There are a few species, natives of the Province of Buenos Ayres, which may be particularised. N. bonariensis, having white flowers; N. glauca, yellowish green flowers; N. longiflora, white flowers; and N. viscosa, pink flowers.

The important mineral substances presented in Havanna tobacco, examined by Hertung, are in 100 parts of ashes,

Salts of potash     34.15
Salts of lime       51.38
Magnesia             4.09
Phosphates           9.04

These substances were for the most part insoluble in earth, and must have been dissolved during the growth of the crop.

ANALYSIS  OF FIVE SAMPLES OF TOBACCO. 
No. 1.      No. 2.      No. 3.      No. 4.      No. 5. 
Grown on argillaceous soil               Grown in calcareous soil. 
Potash              29.08      30.67       9.68       9.36      10.37
Soda                 2.26        —­         —­         —­         .36
Lime                27.67      24.79      49.28      49.44      39.58
Magnesia             7.22       8.57      14.58      15.59      15.04
Chloride of sodium    .91       5.95       4.61       3.20       6.39
Chloride of potassium —­         —­        4.44       3.27       2.99