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Cell production or development; cytogenesis.

The fertilized egg cell or parent cell, from the development of which the child or other organism is formed. Hæckel.

odine, or iodine and bromine, on which, after exposure in the camera, the latent image is developed by the vapor of mercury.

etter; herpetic. Dartroud diathesis, A morbid condition of the system predisposing to the development of certain skin deseases, such as eczema, psoriasis, and pityriasis. Also called rheumic diathesis, and hipretism. Piffard.

ing to Darwin; as, the Darwinian theory, a theory of the manner and cause of the supposed development of living things from certain original forms or elements.

Diminution or reduction of strength, efficacy, or value; degeneration; deterioration. The development and degradation of the alphabetic forms can be traced. I. Taylor (The Alphabet).

Having the typical characters or organs in a partially developed condition, or lacking certain parts. Some families of plants are degraded dicotyledons. Dana.

tion of the novelist must be characterized, to speak craniologically, by an extraordinary development of the passion for delitescency. Sir W. Scott.

The division of Cetacea in which the teeth are developed, including the sperm whale, dolphins, etc.

The development and cutting of teeth; teething.

r mark by a specific difference; to effect a difference in, as regards classification; to develop differential characteristics in; to specialize; to desynonymize. The word then was differentiated into the two forms then and than. Earle. Two or more of the forms assumed by the same original word become differentiated in…

The gradual formation or production of organs or parts by a process of evolution or development, as when the seed develops the root and the stem, the initial stem develops the leaf, branches, and flower buds; or in animal life, when the germ evolves the digestive and other organs and members, or when the animals as the…

having the appearance of lacking one half; as, a dimidiate leaf, which has only one side developed.

Having two modes of embryonic development.

The treatment suited to a disciple or learner; education; development of the faculties by instruction and exercise; training, whether physical, mental, or moral. Wife and children are a kind of discipline of humanity. Bacon. Discipline aims at the removal of bad habits and the substitution of good ones, especially thos…

unity of embryonic structure reveals community of descent; but dissimilarity of embryonic development does not prove discommunity of descent. Darwin.

To develop. [Obs.]

See Devest. Mozley & W.

achia, the ova of which become attached to the skin of the back of the parent, where they develop; dorsiparous.

m or duality. Dualistic system or theory (Chem.), the theory, originated by Lavoisier and developed by Berzelius, that all definite compounds are binary in their nature, and consist of two distinct constituents, themselves simple or complex, and possessed of opposite chemical or electrical affinities.…