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an alkali or to alkalies; having the properties of an alkali. Alkaline earths, certain substances, as lime, baryta, strontia, and magnesia, possessing some of the qualities of alkalies. -- Alkaline metals, potassium, sodium, cæsium, lithium, rubidium. -- Alkaline reaction, a reaction indicating alkalinity, as by the…

An organic base, especially one of a class of substances occurring ready formed in the tissues of plants and the bodies of animals.

.), to be on the same footing; to correspond (with) exactly; to be alike in all the circumstances to be considered. "This example is on all fours with the other." "No simile can go on all fours." Macaulay.

A crystalline, transparent, colorless substance found in the allantoic liquid of the fetal calf; -- formerly called allantoic acid and amniotic acid.

incipal subject is described by another subject resembling it in its properties and circumstances. The real subject is thus kept out of view, and we are left to collect the intentions of the writer or speaker by the resemblance of the secondary to the primary subject.

varying proportion among the organisms themselves. Allelomorphs which under certain circumstances are themselves compound are called hypallelomorphs. See Mendel's law. -- Al*le`lo*mor"phic (#), a.

Any one of two or more distinct crystalline forms of the same substance; or the substance having such forms; -- as, carbonate of lime occurs in the allomorphs calcite and aragonite.

To change in physical properties but not in substance. [R.]

Abatement; deduction; the taking into account of mitigating circumstances; as, to make allowance for the inexperience of youth. After making the largest allowance for fraud. Macaulay.

A substance produced by acting upon uric with warm and very dilute nitric acid.

To reduce the purity of by mixing with a less valuable substance; as, to alloy gold with silver or copper, or silver with copper.

At or from a distance, but within view, or at a small distance; apart; away. Our palace stood aloof from streets. Dryden.

Rays of relatively low penetrating power emitted by radium and other radioactive substances, and shown to consist of positively charged particles (perhaps particles of helium) having enormous velocities but small masses. They are slightly deflected by a strong magnetic or electric field.

The perpendicular distance from the base of a figure to the summit, or to the side parallel to the base; as, the altitude of a triangle, pyramid, parallelogram, frustum, etc.

e of alumina. This metal is white, but with a bluish tinge, and is remarkable for its resistance to oxidation, and for its lightness, pertaining a specific gravity of about 2.6. Atomic weight 27.08. Symbol Al. Aluminium bronze or gold, a pale gold- colored alloy of aluminium and copper, used for journal bearings, etc.…

A spongy, combustible substance, prepared from fungus (Boletus and Polyporus) which grows on old trees; German tinder; punk. It has been employed as a styptic by surgeons, but its common use is as tinder, for which purpose it is prepared by soaking it in a strong solution of niter. Ure.

A characteristic crystalline substance, obtained from oil of bitter almonds.

A substance of the consistence of wax, found floating in the Indian Ocean and other parts of the tropics, and also as a morbid secretion in the intestines of the sperm whale (Physeter macrocephalus), which is believed to be in all cases its true origin. In color it is white, ash-gray, yellow, or black, and often varieg…

A fragrant substance which is the chief constituent of ambergris.

An instrument for measuring distances; -- called also perambulator. Knight.