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Vol. 63 bine with the Br. Thus a smaller fraction of the 18 min. activity becomes water-soluble. Primary recombination or deactivation might, of course, occur also. Substitution into carbon bisulfide occurs slightly less often than into carbon tetrachloride.Alcohol or aniline acts to release the 18 min. bromine in inorganic form either by being attracted by Br atoms undergoing transition and reacting with them enough to prevent recombinations or substitutions or by reaction with the newly formed organic bromides while they are still activated.This tentative picture is based on the following experimental findings. (1) A portion (roughly 25%) of the 18 min. activity ejected from organic compounds in the gas and in the liquid will interchange with Br2 or react with reducing agents, but is not extracted by water. (2) Another portion is readily extracted by pure water. (3) The amount of 18 min. bromine which goes into or remains in organic form is reduced to a minimum by gaseous conditions or by adding alcohol or aniline to liquids. (4) Substitution into carbon bisulfide is observed and into carbon tetrachloride is confirmed. The substitution into carbon tetrachloride occurs either from bromine or alkyl bromides. (5) The products from the gas phase at 21 mm. pressure do not show preference for either negative or positive charged plates. (6) A small dependence of the amount of extraction from Br03on the presence of Brmay indicate that an intermediate form is involved there.

In a previous paper (4) the adsorption of the ammonio copper ion on and coprecipitation with ortho ferric hydroxide has been studied, and a condensed review of the literature on the adsorption and coprecipitation of divalent ions from ammoniacal medium has been given. In the present work the studies have been extended to the adsorption and coprecipitation of zinc, nickel, cobalt, manganese, magnesium, and calcium. materials Most of the reagents and salts used were of c.p. quality. For the purity of ferric chloride and ammonia the reader is referred to a previous study (4). ANALYTICAL PROCEDURESZinc was determined by the ferrocyanide method, using the directions of Kolthoff and Pearson (5). In a few experiments zinc was determined