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first of a series of dependent propositions as a consequence of the denial of the last; a species of reductio ad absurdum. Whately.

The act of determining the relations of an object, as regards genus and species; the referring of minerals, plants, or animals, to the species to which they belong; classification; as, I am indebted to a friend for the determination of most of these shells.

presenting the specific character of minerals, plants, etc., to assist in determining the species to which a specimen belongs.

ptera vampyrus) of the Gulf of Mexico and Southern Atlantic coasts. Several other related species take the same name. See Cephaloptera.

The fruit of certain species of bramble (Rubus); in England, the fruit of R. cæsius, which has a glaucous bloom; in America, that of R. canadensis and R. hispidus, species of low blackberries.

Pertaining to, or possessing the properties of, a species of caustic curves formed by refraction. See Caustic surface, under Caustic.

Scientific determination of any kind; the concise description of characterization of a species.

psychus saularius), allied to the European robin. The name is also given to other related species. -- Dial lock, a lock provided with one or more plates having numbers or letters upon them. These plates must be adjusted in a certain determined way before the lock can be operated. -- Dial plate, the plane or disk of a…

The condition of certain species of plants, in which the stamens and pistil do not mature simultaneously, so that these plants can never fertilize themselves.

Division or distribution of genera into two species; division into two subordinate parts.

A suffrutescent, D. Fraxinella (the only species), with strong perfume and showy flowers. The volatile oil of the leaves is highly inflammable.

now restricted to an American genus which includes the opossums, of which there are many species. See Opossum. [Written also Didelphis.] See Illustration in Appendix. Cuvier.

now restricted to an American genus which includes the opossums, of which there are many species. See Opossum. [Written also Didelphis.] See Illustration in Appendix. Cuvier.

The quality or attribute which is added to those of the genus to constitute a species; a differentia.

The formal or distinguishing part of the essence of a species; the characteristic attribute of a species; specific difference.

Difference of form between members of the same species, as when a plant has two kinds of flowers, both hermaphrodite (as in the partridge berry), or when there are two forms of one or both sexes of the same species of butterfly. Dimorphism is the condition of the appearance of the same species under two dissimilar form…

gastropod mollusks in which the sexes are separate. It includes most of the large marine species, like the conchs, cones, and cowries.

ch the female flowers occur on one individual and the male flowers on another of the same species, and to animals in which the ovum is produced by one individual and the sperm cell by another; -- opposed to monoecious.

on aims and conditions of life, and for sharp, caustic sayings. Diogenes' crab (Zoöl.), a species of terrestrial hermit crabs (Cenobita Diogenes), abundant in the West Indies and often destructive to crops. -- Diogenes' tub, the tub which the philosopher Diogenes is said to have carried about with him as his house, in…

A genus of trees found in the East Indies, some species of which produce a fragrant resin, other species wood oil. The fruit has two long wings.