298 On the Daltonian Theory of [Oct. 



Number of Weight of an 



atoms. integrant particle. 



192. Sulphate of mercury ... .1 s + 1 m 31*000 c 



193. Persulphate of mercury .. 1 s + 1 m 32*000 d 



194. Sulphate of silver 1 s + 1 si 18*618 e 



195. Sulphate of bismuth ....1 s + 1 14994 f 



196. Sulphate of nickel 1 s + 1 n 10*623 g 



197. Sulphate of cobalt 2 s + 1 c 19 326 h 



198. Sulphate of manganese . .2 s + 1 m 19*130' 



an atom of oxide of zinc) :: 25*8 : 27*425. This differs but 

 little from the result which I obtained. 



c According to Berzelius [L'drbok i Kemien, ii. 355), this salt 

 is composed of 16 acid + 84 oxide. Now 5 : 26 : : 16 : 83*2. 

 Hence the composition of the salt is obvious. 



d These numbers are given from theory. We have no good 

 analysis of turpeth mineral. If the numbers in the table be 

 correct, it ought to be a compound of 



Sulphuric acid 15*625 



Peroxide of mercury 84*375 



100*090 



Now Berzelius gives us 12 acid + 88 oxide [L'drbok i Kemien, 

 ii. 364), which does not differ very much from our numbers. 

 The composition of the other mercurial sulphates has not been 

 determined. 



e According to Berzelius, this salt is composed of 25*78 acid 

 + 74*22 oxide. Now 5 : 13*618 :: 25*78 : 70*214. So that 

 the numbers in the table approach very closely to the analysis 

 of Berzelius. 



f According to Lagerhjelm, sulphate of bismuth is composed 

 of 33*647 acid + 66*353 oxide. Now if we suppose it a com- 

 pound of one integrant particle of acid and one of oxide, its 

 composition would be 33*347 acid + 66*653 oxide. 



g The best analysis of this salt that we have is that of Tup- 

 puti. According to him, it is composed of 53*4 acid + 46*6 

 oxide. The numbers in the table suppose its constitution to be 

 47058 acid + 52*942 oxide. Nearly the inverse of Tupputi's 

 analysis. 



h According to the analysis of Rolhoff, this salt is composed 

 of 52*11 acid + 47*89 oxide. Supposing it to consist of 2 

 atoms acid and 1 atom oxide, its constituents would he 51*744 

 acid + 48*i!56 oxide. This differs but little from the analysis. 



' According to John, this salt is composed of 52*06 acid + 

 47*94 oxide. Supposing its constitution as stated in the table, it 



