Physical geography. By Mary Somerville ...

538 GLOSSARYo
GRIT. A coarse-grained sandstone.
GUILANDI'NA. A proper name. A genus of plants of the family of Legumin6os. GUilandicCi Bocldiec, the oval-leaved Nicker-tree.
GUIXEAsNENSIS. Lat. Belonging or relating to Guinea.
GuAr. A vegetable product, which is tasteless and inodorous, and is distinguished by being soluble in water, and insoluble in alcohol: gum-arabic, for
example.
GYMINO'TUS. From the Gr. glmnnos, naked, and notos, back. A genus of fishes.
GYP'suAr. Native sulphate of lime. It is converted into plaster of Paris by
heat.
GYivo'PHORA. From the Gr. guros, a circle, and p7herd, I bear. A genus of
cryptogamous plants.
IIA'BITAT. Lat. He inhabits. Used to designate the place in which animals
and plants are naturally found.
IALIO'TIS. From the Gr. cls, the sea, and ols, the ear. A genus of mollusks.
HA'LCYON. From the Gr. alkuo'on, a king-fisher. A genus of birds.
HELaIAt'THUS. From the Gr. elios, the sun, and cath7os, flower; sunflower.
ll-Exi'ACAL. From the Gr. elios, the sun. Relating to the sun. When a star
rises so as to be visible in morning twilight before the appearance of the sun,
it is said to rise heliacally.
IrEPrTAPHY'LLUM. From the Gr. epta, seven, and p7lhuion, a leaf. Seven-leaved.
A specific name.
HE1RBACEOUS. In botany, Herb-like; that perishes every year. An annual
stem. Not woody.
HERBI'vortA. Lat. Herbivorous.
HERBIn'OROUS. From the Lat. herba, a plant, and vorare, to eat. Plant eating. Applied to animals which feed chiefly or exclusively on plants or herbs.
HIEITIE'RA. Proper name. A genus of plants of the family of Sterculiceem.
HI'BERNATE. From the Lat. hibernare, to winter. Animals which retire and
sleep throughout the winter, are said to hibernate.
HIBI'scus. A genus of plants of the family of Malvacese.
IIIEIco'cHLOA. From the Gr. ieros, sacred, and cisloa, herb. A genus of plants
of the family of Grami'neae.
HIPPOPo'TAMus. From the Gr. iplsos, a horse, andlpotamos, river. River Horse.
A genus of mammals.
H-IRSU'TA. Lat. Hirsute; covered with soft hairs.
IHoL'cus. A genus of plants of the family of Grami'nee.
HO'PEA, or HO'PPEA. Proper name. A genus of plants.
IIo'nRIDA. Lat. Horrid; spiny.
HOo'RARY. From the Lat. 7lora, an hour. The motion of a celestial body, or
the space it moves through in an hour, is termed its h7orary motion.
IonsE'sIHOE MIAGWNET. A magnet in form of a horse-shoe.
HUMII'RIA. A genus of plants of the family of Humoriaceae. They inhabit
tropical America.
HIYDlAN'Gx'EA. From the Gr. ucldr, water, and cagcos, a vessel. A genus of
plants of the family of Saxifrag-ced, and tribe of Hydrangem.
H mYRAUnLIc. From the Gr. iudcr, water, and aulos, a pipe. Relating to liquids
in motion. Hydraulics is that branch of natural philosophy or physics which
treats of the force of water and other liquids in motion.
HYDROSTA'TIC. From the Gr. udlor, water, and stao, I stand. Relating to water
in a state of rest. Hydrostatics is the science which treats of the equilibrium
and pressure of water and other liquids.
HY'DROGEN. From the Gr. uledr, water, and gesnaein, to generate. A colorless,
tasteless, inodorous gas, one part of which, by weight, combined with eight
parts of oxygen forms water;- combined with sulphur it constitutes stul2hmrcttecd Hydrogen;- and with carbon, carburetted IHydrogen, the gas used for
illumination.
IlYnnoRE'T0oN.'A synonym of Otvirau'tdra. A genus of aquatic plants.
IIY'LA. From the Gr. sle, wood, a tree. A tree-fiog.