C 405 3 
XXII. On some Combinations of Phosphorus and Sulphur , and on 
some other Subjects of Chemical Inquiry. By Sir Humphry 
Davy, Knt. LL. D. Sec. R. S. 
Read June 18, 1812. 
l. Introduction . 
In this paper, I shall do myself the honour of laying before 
the Society, the results of some experiments on phosphorus 
and sulphur, which establish the existence of some new com- 
pounds, and which offer decided evidences in favour of an idea 
that has been for some time prevalent amongst many enlight- 
ened chemists, and which I have defended in former papers 
published in the Philosophical Transactions ; namely, that 
bodies unite in definite proportions, and that there is a relation 
between the quantities in which the same element unites with 
different elements. 
I shall not enter into a minute detail of the methods of ex- 
perimenting that I employed; I shall confine myself to general 
statements of the facts. The common manipulations of che- 
mistry are now too well known to require any new illustra- 
tions : and to dA'ell upon familiar operations, would be to 
occupy unnecessarily and tediously the time of this learned 
bodv. 
3 G 
MDCCCXII. 
