558 PROF. LETTS AND MR R. F. BLAKE ON 



Hydrobromate. — Obtained in the same way as the hydriodate : — 



< Calculated for 

 Obtained. 



2(O.H.) 2 HP,HBr 3(0-1 l 7 ),PO,2HBr 



{: 



(1) 195) 



Bromine,. . -J (2) 205 J- I5i) 1444 



(3) 163) 



Platinum Salt. — Prepared by mixing alcoholic solutions of chloride of platinum and 

 of the substance. The compound crystallises out in minute leaflets. Its composition 

 varies with the conditions under which it is prepared. 



Obtained from 





Hofmann's 

 I. 



Dibenzyl Phosphine. 

 II. III. 



Oxide of Tribenzyl Phosphine. 

 IV. V. 



Carbon, 



59-5 



565 



58-5 



58-9 



59-4 



Hydrogen, . 

 Chlorine, 

 Platinum, . 



5-8 

 128 



53 

 131 



5-9 

 131 



53 

 ( 12-4 

 \ 126 



54 



(I., II., III., IV., and V. were all different preparations.) 









Calculated for 



* 





5(C ; 



H 7 ) 2 PH,PtCl 4 





4(C T H 7 ) 3 PO,2HCl,PtCl 4 



Carbon, 



, 



595 





595 



Hydrogen, . 



. 



53 





50 



Chlorine, 









11-7 



Platinum, 





140 





12-5 



Nitro- Compound. — Obtained by dissolving the body in cold fuming nitric acid, and 

 then precipitating with water. Amorphous. 



Obtained. Calculated for 



(With Hofmann's , * , 



Dibenzyl Phosphine.) (C 7 H 6 N0 2 ) 2 HP (C 7 H NO 2 ) 3 PO 



Carbon, . . . 5523 55-26 5538 



Hydrogen, . . 430 4'27 395 



Double Salt with Iodide of Zinc. — This compound separates out when fairly strong 

 alcoholic solutions of the body and iodide of zinc are mixed, in tufts of characteristic 

 needles. 



Obtained from 



Hofmann's Dibenzyl Oxide of Tribenzyl Phosphine. 



Phosphine. I. II. 



Iodine, . . . 26\57 260 259 



Calculated for 



3(C r H 7 ) 2 HP,ZrJ, 2(C 7 H 7 ) 3 PO,ZnI 2 



Iodine, . . . 26 : 43 2648 



Action <>/ fused Potash on Hofmann's " Dibenzyl Phos2)hiue." — In the paper by 

 one of us and W. Wheeler, already referred to, the statement is made that when 

 Hofmann's dibenzyl phosphine is heated with caustic, potash, or soda, " it fuses and 



