412 Sir H. Davy on some Combinations 
20 of phosphorus ; or it must contain several proportions of 
hydrogene to one of phosphorus. 
I venture to propose the name hydrophosphoric gas for the 
new gas; and according to the principles of nomenclature, 1 
have proposed in the last Bakerian lecture, the liquor con- 
taining 20 of phosphorus to 6 j of chlorine may be called phos- 
phor ane, and the sublimate phosphorana. 
3. Of some Combinations of Sulphur. 
I have shewn, in a paper published in the Philosophical Trans- 
actions for 1810, that sulphuretted hydrogene is formed by the 
solution of sulphur in hydrogene, and I have supposed that sul- 
phureous acid, in like manner, is constituted by a solution of 
sulphur in oxygene. There is always a little condensation of vo- 
lume in experiments on the combustion of sulphur in oxygene; 
but this may fairly be attributed to some hydrogene loosely com- 
bined in the sulphur; and to the production of a little sulphuric 
acid by the mutual action of hydrogene, oxygene, and sulphur. 
It is only necessary, if these data be allowed, to know the 
difference between the specific gravity of sulphureous acid gas 
and oxygene, and sulphuretted hydrogene and hydrogene, to 
determine their composition. 
In the Philosophical Transactions for 1810, page 254 , 1 have 
somewhat under-rated the weights of sulphuretted hydrogene 
and sulphureous acid gasses : for I have since found, that the 
cubical inch measures, employed for ascertaining the volumes of 
ga-s weighed, were not correct. From experiments w'hich I think 
may be depended upon, as the weights of the gasses were merely 
compared with those of equal volumes of common air, I found 
that 1 00 cubical inches of sulphureous acid gas weighed 68 grains 
