SIXCE the last communication on this subject (Trans., 1892, 765) the investiga,tion has been carried on during all available opportunities, and results have been obtained which appear t o us sufficiently interesting to warrant, our offering another instalment t o the Society. Dibromonitroizaphthalene, CloH,Br*NO,.Br = 1 : 2 : 4, rn. $7. 117O.-A considerabje quantity of this compound, which was briefly described in the previous communication (p. 769), has been prepared and some of its

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... studied. Analysis of a specimen purified by crystallisation from alcohol gave the following results.