t)F ARTS AND SCIENCES. 255 



Bromine 45.81 45.82 45.56 



Properties. Fine white needles matted together into a woolly mass, 

 or forming circular radiated gi'oups, insoluble in water, very slightly 

 soluble in alcohol hot or cold, not freely in warm ether, but easily in 

 hot ligroin, from which it crystallizes on cooling. In the preparation 

 from alcoholic ammonia and parabrombenzylbromide it sometimes 

 appears in needles 12 cm. long. 



No definite chloride could be obtained even by precipitating the 

 platinum as sulphide from the chlorplatinate, and washing with alcohol, 

 as this gave only a viscous varnish. 



Triparabromhcnzykanine Chlorplatinate [(Cj;H^BrCIT^)oNH]„PtClg 

 made by adding chlorplatinic acid to an ethereal solution of the free 

 base, and purified by washing with water, alcohol, ether, and ligroin, 

 gave the following result on analysis: — 



0.3254 grm. of the salt gave 0.0432 grm. of Pt. 



Calculated for [(CTHeBrJsNHljPtClg. Found. 



Platinum 13.51 • 13.28 



Corn-yellow indistinct crystals, insoluble or nearly so in all the 

 common solvents. 



Monoparaiodhenzylamine, G^HJGH^NH.^. 



Mr. C. r. Mabery has, at my request, prepared this substance, which 

 he had not obtained in quantity sufficient for analysis, when he pub- 

 lished his paper on the paraiodbenzyl compounds, by heating paraiod- 

 benzylbromide with a large excess of alcoholic ammonia* in a sealed 

 tube to 120°. It is easily separated from the secondary and tertiary 

 amines by washing with water, and, upon adding sodic hydrate to the 

 solution of its bromide thus obtained, and extracting with ether, the 

 carbonate is left as the ether evaporates in the form of a white solid 

 melting at 113°. 



The chloride made from the carbonate with hydrochloric acid forms 

 slender white needles melting at 240°, readily soluble in water and 

 alcohol, si)aringly in ether. 



The chlorplatinate (CgH^ICH2NH3)2PtClg made by adding chlor- 



