It is the purest of all
gums.
_Hardpan_: The hard, unbroken layer of earth below the mould or
cultivated soil.
_Hartshorn_, (spirits of:) A volatile alkali, originally prepared
from the horns of the stag or hart, but now procured from various other
substances. It is known by the name of ammonia or spirits of ammonia.
_Hemlock_: see _Cicuta.
_Horticulturist:_ One skilled in horticulture, or the art of cultivating
gardens: horticulture being to the garden what agriculture is to the
farm, the application of labor and science to a limited spot, for
convenience, for profit, or for ornament--though implying a higher
state of cultivation than is common in agriculture. It includes the
cultivation of culinary vegetables and of fruits, and forcing or exotic
gardening as far as respects useful products.
_Hydrogen_: A very light, inflammable gas, of which water is in part
composed. It is used to inflate balloons.
_Hypochondriasis_: Melancholy, dejection, a disorder of the imagination,
in which the person supposes he is afflicted with various diseases.
_Hysteria or hysterics_: A spasmodic, convulsive affection of the
nerves, to which women are subject.
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