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doubly periodic. -- Periodic law (Chem.), the generalization that the properties of the chemical elements are periodic functions of their atomic wieghts. "In other words, if the elements are grouped in the order of their atomic weights, it will be found that nearly the same properties recur periodically throughout th…

rganic substances by which they lose the cohesion of their parts and pass through certain chemical changes, giving off usually in some stages of the process more or less offensive odors; to become decomposed by a natural process; to putrefy; to decay. Fixed like a plant on his peculiar spot, To draw nutrition, propagat…

ng native. -- Sal Jovis Etym: [NL.] (Old Chem.), salt tin, or stannic chloride; -- the alchemical name of tin being Jove. -- Sal Martis Etym: [NL.] (Old Chem.), green vitriol, or ferrous sulphate; -- the alchemical name of iron being. Mars. -- Sal microcosmicum Etym: [NL.] (Old Chem.) See Microcosmic salt, under Mic…

t of sorrel, below. -- Salt of Saturn (Old Chem.), sugar of lead; lead acetate; -- the alchemical of lead being Saturn. -- Salt of Seignette. Same as Rochelle salt. -- Salt of soda (Old Chem.), sodium carbonate. -- Salt of sorrel (Old Chem.), acid potassium oxalate, or potassium quadroxalate, used as a solvent for…

A wide-mouthed bottle with glass stopper for holding chemicals, especially crystallized salts.

tance, formed in the decomposition of creatin (one of the constituents of muscle tissue). Chemically, it is methyl glycocoll.

To satisfy the affinity of; to cause to become inert by chemical combination with all that it can hold; as, to saturate phosphorus with chlorine.

A chemical earth, the oxide of scandium.

Chemical analysis.

oming after in time, without asserting or implying causative energy; as, the reactions of chemical agents may be conceived as merely invariable sequences.

A theory proposed by Ehrlich as a chemical explanation of immunity phenomena. In brief outline it is as follows: Animal cells and bacteria are complex aggregations of molecules, which are themselves complex. Complex molecules react with one another through certain of their side chains, but only when these side chains h…

to set the air within the tube in vibration, causing sound. The apparatus is called also chemical harmonicon. -- Singing master, a man who teaches vocal music. -- Singing school, a school in which persons are instructed in singing.

s a product of the putrefaction of albuminous matter. It is also found in reduced indigo. Chemically it is methyl indol, C9H9N.

specially fitted. -- Skeleton leaf, a leaf from which the pulpy part has been removed by chemical means, the fibrous part alone remaining. -- Skeleton proof, a proof of a print or engraving, with the inscription outlined in hair strokes only, such proofs being taken before the engraving is finished. -- Skeleton regi…

To lose cohesion or solidity by a chemical combination with water; to slake; as, lime slacks.

To mix with water, so that a true chemical combination shall take place; to slack; as, to slake lime.

common salt. It is used in making soap, glass, paper, etc., and as alkaline agent in many chemical industries. Called also sal soda, washing soda, or soda. Cf. Sodium bicarbonate, above and Trona. Sodium chloride, common, or table, salt, NaCl. -- Sodium hydroxide, a white opaque brittle solid, NaOH, having a fibrous s…

Chemical; alchemical. [Obs.]

a sect which arose in the days of alchemy, who sought to discover remedies for disease by chemical means. The spagyrists historically preceded the iatrochemists. Encyc. Brit.

absorbing a portion of the rays. It is characterized by dark spaces, bands, or lines. -- Chemical spectrum, a spectrum of rays considered solely with reference to their chemical effects, as in photography. These, in the usual photogrophic methods, have their maximum influence at and beyond the violet rays, but are not…