Royal Society. 519 



retted hydrogen is obtained, while the chlorides give two atoms of 

 hydrochloric acid, 



G^JO + P^S =3J^JS + 2P03H3 



6j}|o + 2PCl3=6HCl4-2P03H3. 



Similar reactions are observed with organic compounds belonging 

 to the series of water with the formation of phosphorous and phos- 

 phoric acids respectively, or a conjugate acid. By acting in this 

 way, the following series of sulphuretted organic compounds is ob- 

 tained, by the side of which are placed for comparison the products 

 formed by the action of the chlorides of phosphorus on the same 

 substances. 



Sulphuretted Hydrogen. Hydrochloric Acid. 



{]JS. 2HC1. 



Mercaptan. Chloride of ^thyle-1- Hydrochloric Acid. 



^'JJHS. C^^H^Cl-fHCl. 



Sulphide of iEthyle. ^^^^^^^ ^^ ^^j^^j^ 



gH:}s. 2C^H3C1. 



Othyl.Hydrosulphuric Acid. ^^^^^.^^^ ^^ Othyle+ Hydrochloric Acid. 

 C*^'2JS. C'^H3 0,C1 + HC1. 



Othyl-SulpMde of Othyle. C\AouA^ of Othyle. 



c'S'o}^- 2C^H3 0,C1. 



Othyl-Sulphide of Othyle. ci^x^^A^ of Othyle + Chloride of othyle. 



^'w'^ls. C2H3 0,C1-|-C2H^C1. 



C^H* J 



Mercaptan is obtained by the action of tersulphide or pentasulphide 

 of phosphorus on alcohol with extreme facility. Sulphide of sethyle 

 may also be prepared by acting on sether in a similar manner. 



Thiacetic Acid,— Sulphuretted Acetic Acid, — has been obtained by 

 me by acting on raonohydrated acetic acid with tersulphide of 

 phosphorus. It is a colourless liquid, boiling at about 93° C, and 

 has a peculiar odour resembling sulphuretted hydrogen and acetic 

 acid. It dissolves potassium in the cold and zinc on heating with 

 the evolution of hydrogen, and gives with lead a salt less soluble 

 than the ordinary acetate, so that it gives a precipitate with acetate 

 of lead. By recrystallization from water or alcohol, the lead salt is 

 obtained in fine silky needles, which, though quite colouriess at first, 

 are rapidly decomposed (whether in solution or in the solid form) 

 with the formation of sulphurct of lead. 



By analysis I found the lead salt contained — 



Lead 58 8 per cent, 'i'heory requires 58-0 per cent. 



