EIJ.SHA MITCHELL SCIENTIFIC SOCIETY. 81 



removed from the solid by washing with carbon bisulphide, and 

 on analysis gave : 



p. c. Cr = 2L98. 



p. c. P205 = 29.20 or p. c. P.=n.34. 



The liipiid contained both acids of phosphorus, chromic acid- 

 potassium and chromium. Unfortunately the condition of the 

 phosphorus in this residue was not determined. The amount 

 on hand was insufficient and the changes took place too slowly 

 for another supply to be secured. If possible the reaction will 

 be investigated more closely at some subsequent time. Another 

 solution exposed for a shorter period gave a brownish deposit 

 which yielded an analysis 



p. c. Cr = 41.48. 



p. c. P2O5 = 7.96 or p. c. P.=3.47. 



3d. Solution of Ferric Chloride. 



A very slight precipitate was given after standing several 

 days. Finally a whitish pasty precipitate settled to the bottom. 

 After washing, drying and powdering the color was yellowish 

 white. 



Much iron was left in solution along with hydrochloric and 

 phosphorous acids. The dried precipitate contained 



p. c. Fe = 42.90. 

 p. c. P.= 18.17. 



This approximates to Fe203. 3 Fe PO^. The drying was done 

 at 115° C. and the precipitate was possibly not entirely dried. It 

 can only be definitely stated then that a basic phosphate of some- 

 thing like the above composition was formed. 



Phosphorus placed in a solution of ferrous sulphate became 

 covered with a black, soot-like deposit which seemed to be iron 

 phosphide. 



4th. Solution of Mercuric Chloride. 



A white precipitate was formed within the first twelve hours. 

 This increased with time and proved to be mercnrous chloride. 

 The usual oxidation of the phosphorus took place and its oxy- 

 acids could be detected in the solution. 



