The century dictionary and cyclopedia, a work of universal reference in all departments of knowledge with a new atlas of the world . hyiir{(i(ieii) +ox(y(jc>i) + -t/l.] A compound radical (OH)which has never been isolated, but which is afactor iu avast inimljer of chemical , the oxygen bases are regarded as compounds of hy-droxyl with electropositive atoms or radicals, as sodiumhydroxid, NaOd. The oxygen acids are also regarded ascompounds of hydroxyl with electronegative atoms or i-adi-csls, as sulphuric acid, SI )2(0H)o. Water may be regardedas hydroxyl hydrid, HOH. hjrdrozi
The century dictionary and cyclopedia, a work of universal reference in all departments of knowledge with a new atlas of the world . hyiir{(i(ieii) +ox(y(jc>i) + -t/l.] A compound radical (OH)which has never been isolated, but which is afactor iu avast inimljer of chemical , the oxygen bases are regarded as compounds of hy-droxyl with electropositive atoms or radicals, as sodiumhydroxid, NaOd. The oxygen acids are also regarded ascompounds of hydroxyl with electronegative atoms or i-adi-csls, as sulphuric acid, SI )2(0H)o. Water may be regardedas hydroxyl hydrid, HOH. hjrdrozinkite (hi-drO-zingkit), H. [< Gr. v6ap(icip-), water, 4- E. ctHiito.] A hydrous zinccarbonate occurring in massive earthy foionsof a white or nearly white color. Hydrozoa (hi-dro-zoji), n. pi. [NL., pi. of hy-(Iro-iidii, q. v.] A class of CceJenterata, one oftwo prime divisions of that subkingdom, Acti-?no:o(i being tlio other. The Hydrazua are aquaticand chiefly marine organisms, single or oftener compound,and nearly always soft and gelatinous (in some cases witha chitiuous perisarc). Each individual polypite consists G. Dia^ams of Principal Forms of the Hydrozoa in their mutual , hydra; 2. : 3, calycophoran : 4, physophoriiian ; I. 11. Ill, IV, successive stages of a medusiforni gono-phore, or niediisoid. In any figure : a, ectoderm : d, endodemi:f, digestive and somatic cavity: yl, air-vesicle; B, hydrophyllium:C, hvdrotheca ; F, piieumatophore : G, gonophore ; .V, nectocalyx ;P, tentaculum; -J, hydranth; T, ccenosarc. essentially of a simple sac composed of an outer (ectoder-mal) and an inner (endodermal) membrane^ with a simplegastrovascular cavity or stomach-sac, not differentiatedinto an esophageal tube nor separated from the generalbody-cavity, developed as an outward process of the body-wall, and usually furnished with tentacular reproductive organs are external to the body. Kepro-duetion is accomplished either by
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