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The crystal of m eta-dinitrobenzene, C6H 4(N 0 2)2> is orthorhom bic pyram idal. The dimensions of th e u n it cell, which contains 4 molecules, are a = 13-3A, 6 = 14*1 A, c = 3-80A and th e space group is Pbn. The m ethod of double F ourier series has been applied, and a projection of th e electron density on th e ab plane has been m ade. The plane of th e benzene ring of th e molecule is inclined a t an angle of 20° to th e 6-axis, and is parallel to th e a-axis. W ithin th e lim its ofdoi:10.1098/rspa.1946.0096 fatcat:z65rsiq3hngpfmyf43fiabgume