110 On the Daltonian Theory of [Aug. 



*f umbiT of Wright of an 



atoms. integrant particle. 



111. Sulphuret of platinum . .1 p 4- 2 s 16*16! b 



112. Sulphuret of silver 1a + 1 s 14*618 c 



113. Prosulphurct of met-? t N 2 7-000 J 



cury 3 



114. Persulphuret of mer-? 1 m g f oq-qoo - 



cury or cinnabar 3 



115. Sulphuret of copper 1 c + I s 1 0-000 r 



1 16. Magnetic pyrites 1 i + 2 s 10-666 s 



little doubt that a sulphuret of that metal exists. Now, accord- 

 ing to the experiments of Oberkampf, this sulphuret is composed 

 of 100 gold + 24-39 sulphur. Now an atom of gold is 24*968, 

 and 100 : 24*39 :: 24*968 : 609. Now 6*09 is almost exactly 

 equal to 3 atoms of sulphur. 



b According to the experiments of Berzelius, 100 platinum 

 combine with 32*8 of sulphur. (La'rbok i Kemien, ii. 424.) Now 

 an atom of platinum weighs 12*161 ; and 100 : 32*8 :: 12*161 

 : 3*989 ; but 3*989 is very nearly equal to the weight of 2 atoms 

 of sulphur. 



c According to Berzelius, 100 silver combine with 14*9 sul- 

 phur. Now 100 : 14-9 :: 12*61S : 1*8S ; but 1*88 is not much 

 less than the weight of an atom of sulphur ; all other analists 

 make the weight exceed 14*9 a little. 



A When the salts of mercury containing the black oxide are 

 dissolved in water, and a current of sulphureted hydrogen passed 

 through the solution, a black powder precipitates, composed, 

 according to Sefstrom's analysis, of 100 mercury 4- 8-005 sul- 

 phur. (Larbok i Kemien, ii. 350.) Now 100 : 8-005 :: 25 : 

 2*001 ; but 2-001 is almost exactly equal in weight to an atom ot 

 sulphur. 



e Cinnabar, according to Sefstrom's analysis, is composed of 

 100 mercury + 1601 sulphur. Now 100 : 16-01 :: 25 : 4-002: 

 but 4*002 is almost exactly equal in weight to 2 atoms of sul- 

 phur. (Larbok i Kemien, ii. 348.) 



f From the most exact experiments hitherto made, it appears 

 that 100 copper combine with 26 sulphur. Now 100 : 26 :: 8 : 

 2-08 ; but 2*08 differs but little from the weight of an atom of 

 sulphur. 



s According to the analysis of Proust and Hatchet, magnetic 

 pyrites is composed of 100 iron + 60 metal. Now 100 : 60 :: 

 6-666 : 3*9996 ; but 3*9996 is almost exactly the weight of 2 

 atoms of sulphur. Berzelius found it composed of 100 iron -f 

 58*75 sulphur. This gives 3*916 for the sulphur, still very near 

 the weight of 2 atoms. 



