OP ARTS AND SCIENCES. 253 



The melting-point of the pure alcohol was 77°.* In other respects 

 its properties are given correctly by Mr. Lowery. 



Parabromhenzylcyanide melts at 47° (46° Lowery). The alpha- 

 toluylic acid as before at 114°. 



Parahrombenzyhulphocyanate, CgH^BrCIIjSCN, melts at 25° as 

 given by Mr. Lowery. As this melting-point is much lower than 

 would be expected from that of the benzylsulphocyanate (36°-38° 

 Henry, 41° Barbaglia), I thought it advisable to confirm its formula 

 by the following new analyses : — 



0.2318 grm. of substance gave 0.2447 grm. of BaSO^. 

 0.3804 grm. of substance gave 0.3125 grm. of AgBr. 



Calculated for CiHsBrSCN, Found. 



Sulphur 14.03 14.50 



Bromine 35.09 34.95 



Parabromhenzylamines. Parabrombenzylbromide acts on alcoholic 

 ammonia in the cold, giving a mixture of the three amines, or their 

 brouiides, from which the pure compounds can be easily obtained by 

 washing out the bromide of the primary amine with water, treating 

 the residue with sodic hydrate, and separating the secondary from the 

 tertiary by crystallization from alcohol. 



The jyrimary amine, set free from its bromide with sodic hydrate, is 

 an oil, which can be distilled with steam, and is soluble in ether ; it is 

 rapidly converted into the carbonate by exposure to the air. 



The carbonate, obtained by treating the free base with carbonic 

 dioxide, consists of little white prisms arranged in radiating groups, 

 which melt at ]3l°-133°, are soluble in water and alcohol, insoluble 

 or nearly so in ether, benzol, and carbonic disulphide. 



The chloride, made from the carbonate with hydrochloric acid, forms 

 flattened needles melting with apparent decomposition at 260°, soluble 

 in water and hot alcohol, but slightly soluble in cold alcohol, and 

 essentially insoluble in ether, benzol, and carbonic disulphide. 



The chlorplatinate (CgH^BrCHjNHg), PtClg made from the chloride, 

 and purified by washing with water, gave the following result on 

 analysis : — 



* The high melting-point of the parabrombenzylalcohol made me think that 

 the paraiodbenzylalcohol might melt at a temperature higher than that given 

 by Mr. Mabery in the third paper of this series. He has, however, at my re- 

 quest recrystallized some of it from ligroin, and found that the melting-point 

 remained the same (72°) even after three crystallizations. 



