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That group of vertebrates which develops in its embryonic life the envelope called the amnion. It comprises the reptiles, the birds, and the mammals.

Anything resembling an amphitheater in form; as, a level surrounded by rising slopes or hills, or a rising gallery in a theater.

The division of Vertebrata in which no allantois is developed. It includes amphibians, fishes, and lower forms.

nimal magnetism. See Magnetism and Mesmerism. -- Animal electricity, the electricity developed in some animals, as the electric eel, torpedo, etc. -- Animal flower (Zoöl.), a name given to certain marine animals resembling a flower, as any species of actinia or sea anemone, and other Anthozoa, hydroids, starfishes, e…

ropods, including those having spiral shells. The two sides of the body are unequally developed.

Having some portion of the floral envelopes attached to the pericarp to form the fruit, as in the checkerberry, the mulberry, and the pineapple.

The stipe when developed into an internode between calyx and corolla, as in the Pink family. Gray.

The crest or line in which strata slope or dip in opposite directions.

Of or relating to the antelope.

ught; as, I would not do it for anything. Did you ever know of anything so unlucky A. Trollope. They do not know that anything is amiss with them. W. G. Sumner.

A variety of the gazelle (Antilope, or Gazella, dorcas), found in Arabia and adjacent countries. (b) A squirrel-like Australian marsupial, a species of Petaurus. (c) A beautiful Brazilian toucan Ramphastos ariel).

A literary composition, forming an independent portion of a magazine, newspaper, or cyclopedia.

he whole mass of aëriform fluid surrounding the earth; -- applied also to the gaseous envelope of any celestial orb, or other body; as, the atmosphere of Mars.

of the nature of, or resembling, the atmosphere; as, atmospheric air; the atmospheric envelope of the earth.

gin and formation of all things. This philosophy was first broached by Leucippus, was developed by Democritus, and afterward improved by Epicurus, and hence is sometimes denominated the Epicurean philosophy. -- Atomic theory, or the Doctrine of definite proportions (Chem.), teaches that chemical combinations take plac…

A kind of chætopod larva in which no circles of cilia are developed.

naturalism of Rousseau, the sensationalism of Condillac, and the publication of the "Encyclopedia" by D'Alembert and Diderot. In Germany, Lessing, Mendelssohn, and Herder were representative thinkers, while the political doctrines of the leaders of the American Revolution and the speculations of Benjamin Franklin and T…

A system of natural drainage developed by the constituent streams through headwater erosion.

Developed from an independent center of ossification. Owen. Autogenous soldering, the junction by fusion of the joining edges of metals without the intervention of solder.

ntral line of any design. Anticlinal axis (Geol.), a line or ridge from which the strata slope downward on the two opposite sides. -- Synclinal axis, a line from which the strata slope upward in opposite directions, so as to form a valley. -- Axis cylinder (Anat.), the neuraxis or essential, central substance of a ne…