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



Hydrochlorate* — When warmed with an aqueous solution of hydrochloric acid, the 

 oxide remains unchanged, but if a current of the dry gas be passed over the finely 

 powdered oxide, it is readily absorbed, and a compound is obtained which is unchanged 

 in the air, but decomposes when heated or boiled with water into its constituents. 



Its formula appears to be 4(C 7 H 7 ) 3 P0,3HC1. 



Hyd rob r ornate. — According to Collie (loc. cit.), a similar compound is formed with 

 hydrobromic acid. One of us and W. Wheeler obtained a compound by saturating a 

 hot solution of the oxide in glacial acetic acid with hydrobromic acid gas, when it 

 separated as the solution cooled in colourless crystals. Its composition varied widely in 

 two separate preparations. 



Analysis. 



Obtained. Calculated for 



I. II. 4(C 7 H 7 ) 3 PO,3HBr 3(C 7 H 7 ) 3 PO,2HBr (C 7 H 7 ) 3 PO,HBr 



Bromine, 195 to 205 16-3 15-75 14*26 19*95 



Hydriodate. — Obtained by one of us and W. Wheeler by the same method as the 

 hydrobromate. 



Analysis. 



Obtained. Calculated lor 



I. ii. 4(C 7 H 7 ) 3 PO,3HI 3(C 7 H 7 ) 3 PO,2HI (C 7 H 7 ) 3 PO,HJ 



Iodine, 2P0 21-5 22-9 20-88 28-34 



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



platinum, and crystallised in minute orange leaflets. It is somewhat unstable, and its 



composition varies with the conditions under which it is obtained. Its probable 



formula is — 



4(C 7 H 7 ) 3 PO,2HCl ) PtCl 4 ,t but possibly 3(C 7 H 7 ) 3 PO,PtCl 4 + 



Palladium Salt. — Fleissner obtained this body by precipitating a solution of the 

 oxide with palladous chloride. It is a brown-red crystalline mass of the formula 

 3(C 7 H 7 ) 3 PO,PdCl 2 . 



Ferric Chloride Compound. — Sulphur yellow prisms of considerable size. Formula : 

 3(C 7 H 7 ) :J PO,Fe 2 Cl 6 (Fleissner). 



Mercuric Chloride Compound. — Beautiful colourless prisms or pyramids. Formula : 

 3(C 7 H 7 ) 3 PO,HgCl 2 (Fleissner). 



Cobaltous Chloride Compound. — Blue needles. Formula: 3(C 7 H 7 ) 3 PO,CoCl 2 

 (Fleissner). 



* Collie, Ohem. Hoc. Jour., 1889, p. 227. t Letts and Collie, loc. cit. j Fleissner, loc. cit. 



