1864.] Prof. A. H. Church on certain Ethjlphosphates* 527 



The mean of the first four experiments gives 14*022 as the percentage 

 amount of ferrosum in the compound. The theory (Q>^ Hg)3 (Fe'")2 (re')3 

 3PO, + 3xiq demands 14-841. 



The mean of the last two experiments gives 24*402 as the total percentage 

 of iron in the compound. The theoretical percentage is 24*745. If the 

 experimental mean percentage of ferrosum be deducted from the total mean 

 percentage of iron arrived at by experiment, thus, 24*402— 14*022= 10*38, 

 the number arrived at gives the percentage of ferricum in the compound ; 

 the formula above given requires 9*894 per cent. : thus the experimental 

 percentage exceeds the theoretical by '486 per cent. — a small error, consi- 

 dering the very great difficulties attending the manipulation of this easily 

 oxidized salt. 



Uranylic Ethylphosphate. — Some pure uranic oxide, TJr^ O3, was pre- 

 pared by repeatedly acting on uranic nitrate with alcohol, the pasty mixture 

 being heated on a water-bath. When the separation of the oxide was com- 

 plete, it was mixed at a temperature of about 60° or 70° with a weak solu- 

 tion of ethylphosphoric acid. After dilution with hot water and digestion, 

 the solution was filtered and evaporated. As soon as the boiling-point 

 was attained, the solution almost solidified from the separation of clear 

 yellow gelatinous masses of the new salt. These were collected by filtration 

 of the boiling liquid after a portion of the water had evaporated. Sub- 

 mitted to analysis, they gave results leading to the formula C2 H., O^, 

 PO^ + Aq. This uranic salt thus agrees in constitution with the inorganic 

 uranic phosphates already known, and lends additional support to Peligot's 

 Uranyle theory. The following list gives the formulse of various uranylic 

 phosphates, uranyle being represented by the expression O : — 

 U^O, H2, PO^-f Aq Monuranic phosphate. 



2U,0, H, P0, + 3Aq] .... 



3 U2 O, PO4 (?) Triuranic phosphate. 



2 U2 O, Ca, PO4 + 4 Aq .... Diurano-calcic phosphate (lime-uranite). 



C2H5, 2U2O, PO.-fAq . . Diurano-ethylphosphate. 

 This new uranic salt, like many other ethylphosphates, is less soluble in 

 water at 100° than in water at 60° or 70°. It separates from its solutions 

 in pale yellow flocks, which dry up in the water-oven into amorphous brittle 

 masses of a bright lemon-yellow colour. Attempts to replace a portion of 

 the uranyle in this salt by calcium and by silver led to no definite results. 

 The following are the analyses of the uranyhc ethylphosphate dried at 100° : 

 I. -517 grm. gave *106 grm. of Co^ and -0835 grm. of O. 

 II. -375 grm. gave *254 grm. of protosesquioxide of uranium, Ug O^. 



III. -3335 grm. gave *226 grm. of O,. 



IV. -6645 grm. gave -1735 grm. of Mg.P^O,. 



V. -1 grm dried at 100° lost at 150° -044 grm. of H,0. 

 These results correspond to the following percentages : — 



