OF ARTS AND SCIENCES. 207 



With cupric sulphate, pale bluish-green flocks, insoluLle in water, but 

 soluble in acids. 



'With ferric chloride, pale yellowish-brown flocks, insoluble in water. 



With chromic chloride or nichelous nitrate, a green precipitate. 



With cohaltous nitrate, a pink precipitate. 



With plumbic acetate, mercurous nitrate^ or aluminic chloride, a 

 white flocculent precipitate. 



With zincic and manganous nitrate, salts which are sparingly solu- 

 ble in water and crystalline ; the manganese salt is flesh-colored. No 

 precipitate was obtained with salts of cadmium, magn,esium, strontium, 

 and the alkaline metals. In general, its salts resembled very closely 

 those of the corresponding parabromalphatoluylic acid. 



Paraiodbenzylsulphocyanate, GqII^ICII.^S CJ}1, was made bj'^ boiling 

 an alcoholic solution of potassic sulphocyanate with paraiodbenzylbro- 

 mide : the oil obtained by precipitating the product with water solidi- 

 fied upon cooling, and was purified by draining on filter-paper, and 

 ciystallization from hot alcohol. 



0.3661 gr. substance gave 0.4702 gr. COg : the water was lost by 

 breaking the chloride of calcium tube. 



0.2159 gr. substance gave, according to Carius, 0.1S44 gr. baric 

 sulphate. 



Properties. It crystallizes from alcohol in long white lustrous plates 

 which are often twinned ; it has a slight but disagreeable odor, like that 

 of the benzylsulphocyanate; melting-point, 401"; insoluble in water; 

 slightly soluble in cold, more so in hot alcohol, freely in ether, benzole, 

 carbonic disulphide, and glacial acetic acid. 



Paraiodbenztlamines. 



Alcoholic ammonia removed the bromine from the paraiodbenzyl- 

 bromide with great ease : in fact, it was only necessary to warm the 

 substances together in a flask to obtain a voluminous white precipitate 

 consisting of the secondary and tertiary amines. If a more dilute solu- 

 tion was used, the tertiary amine alone was deposited ; while a mixture 

 of this and the secondary amine fell upon adding water. The liquid 

 decanted from this precipitate was evaporated to dryness, and the resi- 



