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A process by which reaction occurs in the presence of certain agents which were formerly believed to exert an influence by mere contact. It is now believed that such reactions are attended with the formation of an intermediate compound or compounds, so that by alternate composition and decomposition the agent is appare…

An agent employed in catalysis, as platinum black, aluminium chloride, etc.

The agency of a cause; the action or power of a cause, in producing its effect. The causality of the divine mind. Whewell.

The act of causing; also the act or agency by which an effect is produced. The kind of causation by which vision is produced. Whewell. Law of universal causation, the theoretical or asserted law that every event or phenomenon results from, or is the sequel of, some previous event or phenomenon, which being present, the…

Effective, as a cause or agent; causing. Causative in nature of a number of effects. Bacon.

hak. The part they take against me is from zeal to the cause. Burke. Efficient cause, the agent or force that produces a change or redult. -- Final cause, the end, design, or object, for which anything is done. -- Formal cause, the elements of a conception which make the conception or the thing conceived to be what i…

The iron of other agent in cauterizing. Actual cautery, a substance or agent (as a hot iron) which cauterizes or sears by actual heat; or the burning so effected. -- Potential cautery, a substance which cauterizes by chemical action; as, lunar caustic; also, the cauterizing produced by such substance.…

A supposed material or psychical agent or mode of activity other than a force, law, or purpose; fortune; fate; -- in this sense often personifed. It is strictly and philosophically true in nature and reason that there is no such thing as chance or accident; it being evident that these words do not signify anything real…

l, a fine charcoal prepared by calcining bones in a closed vessel; -- used as a filtering agent in sugar refining, and as an absorbent and disinfectant. -- Charcoal blacks, the black pigment, consisting of burnt ivory, bone, cock, peach stones, and other substances. -- Charcoal drawing (Fine Arts), a drawing made wit…

to urge earnestly; as, to charge a jury; to charge the clergy of a diocese; to charge an agent. Moses . . . charged you to love the Lord your God. Josh. xxii. 5. Cromwell, I charge thee, fing away ambition. Shak.

A substance used for producing a chemical effect; a reagent.

to the decomposition of organic substance into more simple bodies, by the use of chemical agents alone. Thudichum.

n, or family; a person in authority who directs the work of others; the pricipal actio or agent.

portant compound being common salt. It is powerful oxidizing, bleaching, and disinfecting agent. Symbol Cl. Atomic weight, 35.4. Chlorine family, the elements fluorine, chlorine, bromine, and iodine, called the halogens, and classed together from their common peculiariries.

An agent which promotes the discharge of bile from the system.

in me clear, not only to discern Things in their causes, but to trace the ways Of highest agents. Milton.

with the two ends perforated to receive a pin, used on the end of the tongue of a plow, wagen, etc., to attach it to a draft chain, whiffletree, etc.; -- called also clavel, clevy.

revolving disk, usually regulated by clockwork, by means of wich the action of external agents, as light and gravity, on growing plants may be regulated or eliminated.

ss of bodies formed in the coagulation of a albuminous substance by heat, acids, or other agents.

Having the power to cause coagulation; as, a coagulative agent. Boyle.