$54: 



SULPHUR AND PHOSPHORUS. 



" orders of Government, I believe, disseminated in different 

 " parts of the country, for the propagation of teak timber. 

 " Amongst others, a few plants were sent to Rampore Baa-, 

 *' leah ; this was in 1795. These plants have throve in a sur- 

 *' prising manner, and are, at this time, between twenty and 

 '* thirty feet high, and near a foot in diameter j tlie wood of 

 " the hardest kind, and, as far as can be judged at present, 

 *' greatly superior to the teak of Pegu." 



WILLIAM ROXBURGH. 

 Calcktta. 

 To C. Taylor, M. D. Sec. 



V. 



On some Comhinations of Phosphorus and Sulphur, and on 

 some other Subjects of Chemical Inquiry. By Sir Kumphry 

 Davy, Knt, LL. D. Sec. R. S. 



The com- 

 pounds of 

 phosphorics 

 and sulphur 

 establish the 

 notious of de- 

 finite propor- 

 tions in com- 

 binations, &c. 



I 



Two distinct 



1. Introduction, 



N 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 

 tha; 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 dwell upon familiar operations, would be to 

 occupy unnecessarily and tediously the time of this Jearned 

 body. 



2. Of some Combinations of Phosphorus. 

 In a paper read before the Royal Society in 1810^ J have 



