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HYP 69
species; these arc extremely common, and as produc.
tive as the simple vegetable. /,'
Hydm, s. from vowp, It-udor, waleI'. A term applied to
a monstrous kind of water-serpent said to have
several heads. It is supposed that the Hydra was
a multitude of serpenls that infested the marshes of
Lerna in Greece. These Hercules is said to have
extirpated by setting fire to the reeds in which they
lodged. The word is sometimes applied, as an
epithet, to that which is productive of a multiplicity
of evils. Thus, an outrageous mob is figurative])'
termed" a hydra-headed monster."
I-Iydr-a~llics, s. frOln ;'Bwp, ll·udur, water, and aVAos,
aul'iJs, a pipe. The'science of conveying water hy
pipes.
Hydro-meter, s. See lIfE'fREO, p. 19. ~', ,~ t', ,1. '"He «.:- i"r-
•
H)'dro-metro-graph, s. See GR~rHE, p. 10.
'\ I
lI)'dro-stntics, s. fro"m {,owp, !l-udul', water, and C1TaTlK.,.
stalike, the science of weighing. The science which
treats of weighing fluids, or of weighing hodies in
fluids.
Hydro-gen, s. Sec GENO, p. 8.
Hydro-phobia, s. from vowp, It-udor, waleI', and