On some Comlinatlons of Phosphorus and Sulphur. « 1 7 



iamp was placed as far below the water to be heated as the 

 flame of the other liad been, tlie new lamp had noL an equiil 

 cFect in less than IBS'". 



Expcr'imenl 5. — ^The two lanips bein<5 weighed, it was 

 found that the oil consumed by t'.^eni in the same length 

 of time was nearly as 10 to 13, the Avgand lamp consum- 

 ing the most. 



I am, sir, 



Your obedient servant, 



Cirencester, Dec. 1, 1812. FrANCIS KeBUV. 



P. S. — Can any of your readers inform me what liquid 

 or solid substance has the property of absorbing the valour 

 of ether ? 



LXXIV. On some Comlbiations of Phosphorus and of Sul- 

 pliur, ami on some other Subjects of Chemical Inquiry. 

 By Sir liuMj>HRv Davy, Knt. LL.D. Sec. R.S.* 



II. IMTRODrCTION. 

 N this paper, I shall do mvself the honour of lay in a; be- 

 fore the Society the results of some expcrim.ents on phos- 

 phorus and sulphur, uliich establish the existence of some 

 new compounds, and which ofi'er decided evidences in fa- 

 vour of an idea that has been for some time prevalent 

 amongst n:ahy enlightened chcndsts, and which I have de- 

 fended in former papers published in the Philosophical 

 'rr.'insactions ; nan)ely, that bodies unite in definite pro- 

 portions, and that tlierg is a relation between the quantities 

 in which the same element u'.iites with ditferenl elements. 



I shall not enter into a minute detail of the methods of 

 expernnenting that 1 employed j I shall conline myself to 

 general stateujcnls of the facts. 'I'he common maiupula- 

 tions of chemistry are now too well known to require any 

 new illustrations : and to dwell upon familiar o|)eralions 

 would be to occupy unnecessarily and tediously the time of 

 this learned body. 



2. OJ some Comlinations of Phosphorus. 



In a paper read before the lloval Society in 1810, I have 

 <.lescrd)ed the mutual aciion of phospliorus and o.w nniriaiic 

 g IS, or chlorine. I have noticed two conq.ounds which 

 appear to be distinct and ptenliar bodies, tornied by the 

 iinion ol the gas and the intiammable substance. One ij 



• From I'hiloi. Trau». lut ISlVJ, part ii. 



Vol.4!). No. IJf). Dec. 1812. Dd solid. 



