Chromule

( Bot. ) Same as CHLOROPHYL, q. v. Chron'ic, Chron'ical, a. [Fr. chronique; Gr. chronikos, from chronos, time, duration.] Relating to time. (Med.) Continuing or remaining for a long time; opposed to acute, and applied to all diseases which have pa ed their first or active stage without being cured. Chronicle, (kron'e- kl ,) n. [Fr. chronique. (Liter.) An historical account of facts or events disposed chronologically or in the order of time. Most of the historians of the Middle Ages were chroniclers who set down the events which happened within the range of their information, according to the succe ion of years ( Script .) The name of two books in the canon of Scripture. They consist of an abridgment of sacred history from its commencement down to the return of the Jews from the Babylonish captivity, and are called by the Septuagint παραλειπόμενα (lit. things omitted), because they contain many supplemental relations omitted in the other historical books. It has been supposed by Eichhorn, and many other writers, that the Chronicles were compiled by Ezra, though circumstances are not wanting to diminish the probability of this conjec junction with sulphuric acid in the laboratory as an oxidizing agent, and in commerce in the same manner in bleaching sperm-oil. The bichromate of ammonia is used in photography. Except the chromate of lead, which is described under CHROME-YELLOW, the other chromates and bichromates are unimportant. Chro'mite, n. ( Min .) See CHROME IRON-ORE. Chro'mium, CHROMIUM ORE, CHROME, n. [Gr. chroma , color; Fr. chrome.] (Chem.) A pretty rare element, first shown to be a metal by Vauquelin, in 1797. Its most important ore is the chrome iron-stone, a compound of protoxide of iron and sesquioxide of chromium. It is also found as chromate of lead, from which mineral Vauquelin first obtained it in the metallic state. To effect its reduction, oxide of chromium is intimately mixed with powdered charcoal, and made into a paste with oil. It is then introduced into a crucible lined with charcoal, and carefully luted down. The whole is exposed to the action of a powerful wind-furnace for several hours, and an impure mixture of carbon and chromium is formed in the crucible. Mr. Frenny has lately succeeded in procuring chromium in the form of cubical metallic ma es, by pa ing the vapor of sodium over the sesquioxide heated to redne . By heating sesquichloride of chromium with pota ium, a gray metallic powder is formed, which consists of chromium in an allotropic condition. Chromium is a light-gray metal, very brittle, non-volatile, and non-magnetic. As might be inferred from the difficulty with which it is Chronicler, ( kron'i -kler,) n. A writer of a chronicle reduced, chromium, in the metallic state, has not yet received any useful application. Its oxide and many of the chromates have received useful applications in calico-printing and china-painting.--Equivalent, 521; sp. grav., 5-9; symbol, Cr. ture. v. a. To record facts or events in the order of time; to register; to keep an account of; as, to chronicle the history of a reign. "To suckle fools, and chronicle small beer." - Shaks. or chronicles; a historian; one who records facts and events. Such an honest chronicler as Griffith." - Shaks. Chronogram, Chronograph, n . [From Gr. chronos, time, and gramma, a letter.] An inscription comprehending a date, which may be read by selecting all or some of the numeral letters, which are frequently written in these curious trifles in larger characters than the rest; as the motto of a medal struck by Gustavus Adolphus in 1632: Oxides of C. Chromium forms several compounds with oxygen, of which the most important are four:Protoxide, CrO; sesquioxide, Cr2O3; chromic acid, CrO3; per chromic acid, Cr2O7. - Protoxide of chromium can only be obtained in the state of hydrate on adding caustic potash to a solution of the pro to chloride. It absorbs oxygen with great avidity, decomposing water and set- Chronogrammatic,Chronogram mat i cal, ting free the hydrogen, becoming converted into a hy "Chris tVs DVX ergo trIVMph Vs." a. Belonging to, or containing, a chronogram.