PHOSPHORUS. 97 



The terchloride was prepared by chloridizing finely divided 

 P with dry chlorine, adding finely divided P, decanting, 

 agitation with tin amalgam and rectification over the same. 

 The fluid was colorless and did not give any precipitate 

 with water. {Paris, Comptes Bend., SO, 1845, 1047.) 



V. A. Jacquelin : 29.83 (0 = 16) ; 186.438 (O = 

 100). 



Determined by experiments on the chlorides of phos- 

 phorus with argentic nitrate and plumbic oxide. The re- 

 sults are utterlv discordant. {Paris, Corn,ptes Rend., 33, 

 1851, 693.) 



A. ScHROETTER : 31.0274 (0 = 16). 



Determined by burning perfectly pure amorphous phos- 

 phorus in dry oxygen and weighing the phosphoric anhy- 

 dride. The number is the mean of 10 experiments ; 

 extreme difterence, 0.1242. Previous to burning, the phos- 

 phorus was heated for a long time in carbon di-oxide or 

 hydrogen. It was burned not in powder but in lumps. 

 {jErdmann's Journ. filr Prak. Chem., 53, 1851, 435 ; Sitz.- 

 Berichi der k. k. Akad., 18^1.) 



B. C. Brodie : 31.31 (0 = 16). 



Three experiments made by oxidation of phosphorus 

 with aqua regia and determination as magnesium pyrophos- 

 phate gave this mean. Brodie seems to regard these deter- 

 minations only as evidence that the atomic weight needs 

 redetermination. {Journ. Chem. Soc, 6, 1852, 295.) 



J. Dumas: 31.03 (0 = 16). 



Determined by five experiments on the titration of the 

 terchloride with argentic nitrate. The chloride was pre- 

 pared by the action of dry chlorine on amorphous phos- 

 phorus and distillation after the chlorine had been displaced 

 by carbon di-oxide. The portion distilling between 76° 

 and 78° only was used. The number is the mean of the 

 results; extreme difference, 0.08. Ag=108; 01 = 35.5. 

 {Ayinal. de Chiru. et de Phys., (3,) 55, 1859, 172.) 



