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r foreshadows changes of the weather, as a deep vial of liquid holding in suspension some substance which rises and falls with atmospheric changes.

The positive, or non-acid component of a salt; a substance which, combined with an acid, neutralizes the latter and forms a salt; -- applied also to the hydroxides of the positive elements or radicals, and to certain organic bodies resembling them in their property of forming salts with acids.

An ointment composed of wax, pitch, resin, and olive oil, lard, or other fatty substance.

A name given by Prof. Huxley to a gelatinous substance found in mud dredged from the Atlantic and preserved in alcohol. He supposed that it was free living protoplasm, covering a large part of the ocean bed. It is now known that the substance is of chemical, not of organic, origin.

An unidentified substance mentioned in the Bible (Gen. ii. 12, and Num. xi. 7), variously taken to be a gum, a precious stone, or pearls, or perhaps a kind of amber found in Arabia.

A brown, bitter substance found in some of the cells of honeycomb. It is made chiefly from the pollen of flowers, which is collected by bees as food for their young.

liquor made from any malted grain, but commonly from barley malt, with hops or some other substance to impart a bitter flavor.

A band of leather, or other flexible substance, passing around two wheels, and communicating motion from one to the other.

A transparent crystalline substance,

A transparent crystalline substance, C6H5.CO.NH2, obtained by the action of ammonia upon chloride of benzoyl, as also by several other reactions with benzoyl compounds.

A yellowish crystalline substance, C6H5.CO.CO.C6H5, formed from benzoin by the action of oxidizing agents, and consisting of a doubled benzoyl radical.

A resinous substance, dry and brittle, obtained from the Styrax benzoin, a tree of Sumatra, Java, etc., having a fragrant odor, and slightly aromatic taste. It is used in the preparation of benzoic acid, in medicine, and as a perfume.

An alkaloid obtained, as a bitter, yellow substance, from the root of the barberry, gold thread, and other plants.

(Min.) An earthy substance, resembling fine flour. It is composed of the shells of infusoria, and in Lapland and Sweden is sometimes eaten, mixed with flour or ground birch bark, in times of scarcity. This name is also given to a white powdery variety of calcite.

enetrating rays readily deflected by a magnetic or electric field, emitted by radioactive substances, as radium. They consist of negatively charged particles or electrons, apparently the same in kind as those of the cathode rays, but having much higher velocities (about 35,000 to 180,000 miles per second).…

in beetroot molasses and its residues, from which it is extracted as a white crystalline substance; -- called also lycine and oxyneurine. It has a sweetish taste.

A substance of a resinous nature, obtained from the outer bark of the common European birch (Betula alba), or from the tar prepared therefrom; -- called also birch camphor. Watts.

A compound of two atoms of hydrogen with some other substance. [Obs.]

An extremely adhesive viscid substance, usually made of the middle bark of the holly, by boiling, fermenting, and cleansing it. When a twig is smeared with this substance it will hold small birds which may light upon it. Hence: Anything which insnares. Not birdlime or Idean pitch produce A more tenacious mass of clammy…

er earth (Min.), tale earth; calcined magnesia. -- Bitter principles (Chem.), a class of substances, extracted from vegetable products, having strong bitter taste but with no sharply defined chemical characteristics. -- Bitter salt, Epsom salts;; magnesium sulphate. -- Bitter vetch (Bot.), a name given to two Europe…