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al of a brown to black color occurring in prismatic crystals, often twinned so as to form groups resembling a cross. It is a silicate of aluminia and iron, and is generally found imbedded in mica schist. Called also granatite, and grenatite.

An extensive group of echinoderms, comprising the starfishes and ophiurans.

erized by the impregnation of the mass of rock with many small veins or nests irregularly grouped. This kind of deposit is especially common with tin ore. Such deposits are worked in floors or stories.

A disease in horses and swine, in which the upper part of the throat, or groups of lymphatic glands elsewhere, swells.

A group of small insects having the anterior wings rudimentary, and in the form of short and slender twisted appendages, while the posterior ones are large and membranous. They are parasitic in the larval state on bees, wasps, and the like; -- called also Rhipiptera. See Illust. under Rhipipter.

the humming birds, swifts, and goatsuckers. It is now generally considered an artificial group.

A metallic element of the calcium group, always naturally occurring combined, as in the minerals strontianite, celestite, etc. It is isolated as a yellowish metal, somewhat malleable but harder than calcium. It is chiefly employed (as in the nitrate) to color pyrotechnic flames red. Symbol Sr. Atomic weight 87.3. A rad…

In a wider sense, an extensive group of birds including the ostriches, cassowaries, emus, moas, and allied birds incapable of flight. In this sense it is equivalent to Ratitæ, or Dromæognathæ.

sects parasitic, in their larval state, on bees and wasps. It is the typical genus of the group Strepsiptera, formerly considered a distinct order, but now generally referred to the Coleoptera. See Strepsiptera.

One of the natural groups, more important than an order, into which some classes are divided; as, the angiospermous subclass of exogens.

The incident, scene, figure, group, etc., which it is the aim of the artist to represent.

A division of an order; a group of genera of a little lower rank than an order and of greater importance than a tribe or family; as, cichoraceous plants form a suborder of Compositæ.

A group somewhat lessdistinct than speciesusually are, but based on characters more important than those which characterize ordinary varieties; often, a geographical variety or race.

Any atom, group, or radical substituted for another, or entering a molecule in place of some other part which is removed.

A division of a tribe; a group of genera of a little lower rank than a tribe.

Deviating somewhat from the type of a species, genus, or other group; slightly aberrant.

One of a group of carabid beetles having slender palpi.

ny one of a series of compounds analogous to the ketones, and consisting of the sulphuryl group united with two hydrocarbon radicals; as, dimethyl sulphone, (CH.SO

, phenyl sulphonic acid, C6H5.SO2.OH, a stable colorless crystalline substance. Sulphonic group (Chem.), the hypothetical radical, SO2.OH, the characteristic residue of sulphonic acids.

A group intermediate between a family and a suborder.