491 



small lily-shaped crystals. Dried over sulphuric acid in vacua it 

 contains 



C 26 H 20 NPS 2 , HCl,PtCl 2 . 



The hydrochlorate yields also a precipitate with trichloride of gold ; 

 the salt is, however, rapidly blackened. 



The hydrobromate, both in preparation and properties, resembles 

 the hydrochlorate. Its composition is 



C 26 H 20 NPS 2 ,HBr. 



The urea readily combines with iodide of methyl and ethyl. The 

 methyl-compound immediately separates in the crystalline form on 

 mixing an ethereal solution of the urea with iodide of methyl ; it is 

 soluble in water, and crystallizes from a boiling solution in beautiful 

 golden-yellow needles, containing 



C 26 H 20 NPS 2 , C 2 H 3 I. 



The iodide, by the action of chloride of silver, may be converted 

 into the chloride ; this yields with dichloride of platinum a fine 

 needle-formed salt, which may be recrystallized without decomposi- 

 tion. The formula of this platinum- salt is 



C 26 H 20 NPS 2 ,C 2 H 3 Cl,Pt,Cl 2 . 



When treated with oxide of silver, the iodide furnishes a powerfully 

 alkaline liquid, probably the corresponding base 



[<C, H.) ((C, 8,y (C 4 H s ) 3 (C u H 5 ) NP)] J Q>> 



Scarcely separated, however, this substance decomposes with libera- 

 tion of sulphocyanide of phenyl, the oxide of methyl-triethylphos- 

 phonium remaining in solution. This salt is sufficiently characterized 

 by the readily crystallizable octahedral platinum-salt. 



I have not been able to obtain either the sulphate or the nitrate of 

 the urea, probably on account of the great instability of the new 

 substance. 



On dissolving the base, even in dilute nitric acid, it is immediately 

 decomposed with separation of sulphocyanide of phenyl, the triethyl- 

 phosphine being oxidized. The same change is observed when one 

 of the more stable salts, such as the hydrochlorate, is dissolved in 

 a large quantity of water ; the liquid soon becomes turbid from the 

 elimination of oily globules of sulphocyanide of phenyl, and now con- 

 tains the hydrochlorate of the phosphorus-base. 



On adding ammonia to a salt of the urea, similar phenomena are 



