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production of new compounds or the manifestation of distinctive characters. See Blowpipe reaction, Flame reaction, under Blowpipe, and Flame.

Being, causing, or favoring reaction; as, reactionary movements.

A reactionary. C. Kingsley.

See Catharsis, below.

Previous action.

A test for typhoid fever based on the fact that blood serum of one affected, in a bouillon culture of typhoid bacilli, causes the bacilli to agglutinate and lose their motility.

Of or pertaining to an acid; as, acid reaction.

rocess based on the law of chemical combinations, or the fact that, to produce a complete reaction, a certain definite weight of reagent is required. -- Ac`id*i*met"ric*al, a.

hyde: CH3CHO + CH3CHO = H3CH(OH)CH2CO; also, any of various derivatives of this. The same reaction has been applied, under the name of aldol condensation, to the production of many compounds.

alkalies. -- Alkaline metals, potassium, sodium, cæsium, lithium, rubidium. -- Alkaline reaction, a reaction indicating alkalinity, as by the action on limits, turmeric, etc.

Opposition by which the quality opposed asquires strength; resistance or reaction roused by opposition or by the action of an opposite principle or quality.

ulin, contained in oat kernels, very similar in composition to excelsin, but different in reactions and crystalline form.

A machine, invented in the 17th century, worked by a form of reaction wheel. The water flows into a vertical tube and gushes from apertures in hollow horizontal arms, causing the machine to revolve on its axis.

Apparently alkaline, as certain normal salts which exhibit alkaline reactions with test paper.

NH2, obtained by the action of ammonia upon chloride of benzoyl, as also by several other reactions with benzoyl compounds.

A yellow, or greenish, viscid fluid, usually alkaline in reaction, secreted by the liver. It passes into the intestines, where it aids in the digestive process. Its characteristic constituents are the bile salts, and coloring matters.

Pertaining to, or formed from, two molecules; as, a bimolecular reaction (a reaction between two molecules).

n; a blowtube. Blowpipe analysis (Chem.), analysis by means of the blowpipe. -- Blowpipe reaction (Chem.), the characteristic behavior of a substance subjected to a test by means of the blowpipe.

romine and caustic potash upon wood spirit, alcohol, or acetone, as also by certain other reactions. In composition it is the same as chloroform, with the substitution of bromine for chlorine. It is somewhat similar to chloroform in its effects. Watts.

etable kingdom it is found more or less abundantly in the seeds of leguminous plants. Its reactions resemble those of alkali albumin. [Written also caseine.]