422 On some Combinations of 



clature, I have proposed in the last Bakerian lecture, th2(t tn*^ 

 liqnor containing 20 oF phosphorns to 67 of chlorine ma/ 

 be called p/iosphoratie, and the sublimate phosphorana. 



3. Of some Combinations of Sulplmr. 



I have shown, in a paper published in the Philosophica? 

 Transactions for 1810, that siilphnreited hydrogen is form- 

 ed by the solution of sulphur in hydrogen, aTid I liave sup- 

 posed that sulphureous acid, in like manner, is constituted 

 by a solution of sulphur in oxygen. There is always a 

 little condensation of vokuDC in experiments on the com- 

 bustion of sulphur in pxygcn j but this may fairly be attri- 

 buted to some hydrogen loosely combined in the sulphur; 

 and to the production of a little sulphuric acid by the mu- 

 tual action of hydrogen, oxygen, and sulphur. 



It is only necessary, if those data be allowed, to know 

 the dift'erence between the specific gravity of sulphureous 

 acid gas and oxygen, and sulphuretted hydrogen and hy- 

 drogen, to determine their composition. 



In the Philosophical Transactions for ISIO, page 254, I 

 have sorriewhat under-rated the weights of sulphuretted 

 hydrogen and sulphureous acid cases : for I have since 

 found, that the cubical inch measures, employed for ascer- 

 taining the volumes of gas weighed, were not correct. 

 From experiments which I think may be depended upon, 

 as the weights of the gases were merely compared with' 

 those of equal volumes of common air, I found that 100* 

 cubical inches of sulphureous acid gas weighed 6s grains- 

 at mean temperature and pressure, and 100 cubical inches 

 of sulphuretted hydrogen 36-3 grains, and the last result 

 agrees very nearly with one civen by MM. Gay Lussac and 

 Thenard, and one gained by my brother Mr. John Davy. 



If 34, the weight of 100 cubical inches of oxygen gas, 

 be subtracted from 68, it will appear that sulphureous acid 

 consists of equal weights of sulphur and oxygen, an esti- 

 mation which agrees very nearly with one given by M. Ber- 

 zelias; and if 2-27, the weight of lOO cubical inches of 

 hydrogen, be subtracted from SS-.'i, the remainder 34*23 

 will be the quantity of Sulphur in the gas; and the number 

 representing sulphur may be stated as 30 ; and sulphureous 

 acid as composed of one proportion of sulphur 30, and two 

 of oxygen 30 ; and sulphuretted hydrogen as composed of 

 one proportion of sulphur and two of hydrogen. 



From the experiments of MM. Gay Lussac, it appears 

 that sulphuric acid decou)posed by heat affords one volume 

 •f oxygen to two of sniphuieous acid : from ibis it would 



appear 



