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X. An Account of some Experiments on the Combinations of dif- 
ferent Metals and Chlorine , &c. By John Davy, Esq. Com- 
municated by Sir Humphry Davy, Knt. LL.D. Sec . RrS. 
Read February 27, 1812. 
Introduction. 
Mr brother, Sir Humphry Davy, appears to me to have 
demonstrated, in his last Bakerian Lecture, the existence of 
a class of bodies similar to metallic oxides, and consisting of 
metals in union with chlorine or oxymuriatic acid. 
These combinations are the principal subject of the follow- 
ing pages. I shall do myself the honour of giving an account 
of the experiments I have made to ascertain the proportions 
of their constituent parts, and likewise of describing some that 
have not yet been noticed. 
I shall have to relate also the attempts I have made to as- 
certain the proportions of sulphur in several sulphurets, and 
the experiments I have performed to estimate the quantity of 
oxygene in some metallic oxides. The general analogy of 
definite proportions led me to both these undertakings. This 
analogy, it will be perceived, I have constantly kept in view, 
and have had recourse to, both for detecting inaccuracies in 
my own experiments, and in considering the results of the 
experiments of others. 
As the nomenclature connected with the old hypothesis, 
respecting oxymuriatic acid, is inconsistent with the new views 
Z 
MDCCCXII. 
