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with aniline is bright red; that with naphthalene, yellow. The compounds with amines are beautifully crystalline substances, procurable by warming the components together in alcohol, and are formed generally in the molecular proportions 1 to 1, although diphenylamine and quinoline form compounds in which two molecules of TNB are combined with one of the base.

Trinitrobenzene gives red colors with ammonia and with aqueous alkalies. On standing in the cold with methyl alcoholic sodium methylate, it yields 3,5-dinitroanisol by a metathetical reaction.

OCH,

On boiling with alcoholic soda solution it undergoes a partial reduction to form 3,3',5,5'-tetranitroazoxybenzene.

The first product, however, of the reaction of methyl alcoholic caustic alkali on TNB is a red crystalline addition product having the empirical composition TNB CH30Na £H20, isolated by Lobry de Bruyn and van Leent in 1895. The structure of this substance has been discussed by Victor Meyer, by Angeli, by Meisenheimer, and by Schlenck, and is probably best represented by the formula which Meisenheimer suggested. It is thus

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