OP ARTS AND SCIENCES. 229 



Accordiiiir to the first of these formulas the substance would be a 

 derivative of the red oxide or hydrate of phosphorus, while the second 

 can be developed into [(CeH,NH)3P]2lI,02PC6H.NH; it is possible, 

 therefore, that a study of the decomposition-products of the substance 

 might throw light on its composition. With this view we heated some 

 of it to 140° in a sealed tube with hydrochloric acid, and obtained 

 phosphorous and phosphoric acids, aniline chloride, some carbon, and 

 an odor of phenol, but no red joroduct; we have also found that boil- 

 ing aniline with the red substance, so often mentioned, does not give 

 this compound melting at 208°, so that our results are in favor of 

 the second formula so far as they go, but need revision before much 

 weight can be given to them. 



Properties. The substance crystallizes in small white prisms ap- 

 parently of the monoclinic system, or in long radiating needles with, 

 as far as we could determine, the same melting-point and composition 

 as the prisms ; it melts at 208°, and is insoluble in water, freely 

 soluble in hot alcohol, less so in cold, essentially insoluble in ether. 

 Potassic hydrate in aqueous solution does not act on it at first, but 

 gradually decomposes it if the two are boiled together; sulphuric 

 acid acts in the same way ; the decomposition with hydrochloric acid 

 has been described already. 



Substance Melting at 150°. This compound was obtained at the 

 very end of the term in an attempt to prepare more of the substance 

 melting at 208' ; on this account we cannot give the conditions which 

 determine its formation, or anything more concerning it than the 

 following analyses : — 



0.3492 gr. of substance gave 0.7122 gr. of carbonic dioxide and 

 0.2004 gr. of water. 



0.2562 gr. gave, according to Carius, 0.1330 gr. of argentic chloride 

 and 0.0890 gr. of magnesic pyrophosphate. 



Found. 



Carbon 55.62 



Hydrogen 6.37 



Chlorine 12.83 



Phosphorus 9.70 



It would not be worth while to attempt to determine the formula of 

 this substance until these results have been tested by further analyses. 

 It crystallizes in rather thick white radiating needles, melts at 150°, 

 and resembles the preceding substance in a general way in its 

 solubility. 



At no distant date we hope to be able to return to the study of 



