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A mineral of a blackish green color, commonly massive or in nodules. It is a hydrous phosphate of iron.

A colorless, crystalline, aromatic hydrocarbon, C6H2(CH3)4, off artificial production, with an odor like camphor.

of a sweetish taste and a pleasant ethereal odor, produced by the union of chlorine and ethylene or olefiant gas; -- called also Dutch oil. It is so called because discovered (in 1795) by an association of four Hollandish chemists. See Ethylene, and Olefiant. -- Dutch oven, a tin screen for baking before an open fire…

wer of two; capable of being substituted for, combined with, or replaced by, two atoms of hydrogen; as, oxygen and calcium are dyad elements. See Valence.

dition of not generating or breeding freely; infertility; a form homogenesis in which the hybrids are sterile among themselves, but are fertile with members of either parent race.

The ratio of the distance between the center and the focus of an ellipse or hyperbola to its semi-transverse axis.

te of man and of many domestic and wild animals, forming compound cysts or tumors (called hydatid cysts) in various organs, but especially in the liver and lungs, which often cause death. It is the larval stage of the Tænia echinococcus, a small tapeworm peculiar to the dog.

The outer hyaline layer of protoplasm in a vegetable cell.

A grayish white zeolitic mineral, in tetragonal crystals. It is a hydrous silicate of alumina and baryta.

A mineral of a green color and pearly luster; a hydrous phosphate of copper.

A solid hydrocarbon, C20H42, of the paraffine series, of artificial production, and also probably occurring in petroleum.

A liquid hydrocarbon, C20H38, of the acetylene series, obtained from brown coal.

he name given by Mendelejeff in accordance with the periodic law, and by prediction, to a hypothetical element then unknown, but since discovered and named scandium; -- so called because it was a missing analogue of the boron group. See Scandium.

The name given to a hypothetical element, -- later discovered and called gallium. See Gallium, and cf. Ekabor.

The name of a hypothetical element predicted and afterwards discovered and named germanium; -- so called because it was a missing analogue of the silicon group. See Germanium, and cf. Ekkabor.

inds of matter by any means at present employed; as, the elements of water are oxygen and hydrogen.

The hypothesis that all living things proceed from preëxisting germs, and that these encase the germs of all future living things, inclosed one within another. Buffon.

all brought accurately and without undue effort to a focus upon the retina; -- opposed to hypermetropia, myopia, an astigmatism.

The basal substance of the cell nucleus; a hyaline or granular substance, more or less fluid during life, in which the other parts of the nucleus are imbedded.

One of the higher hydrocarbons of the paraffin series, C11H24, found as a constituent of petroleum. [Written also hendecane.]