1G On the Daltonian Theory of [JulV, 



Number of Weight of an 



atoms. integrant particle. 



269 Perchloride of mercury 2 ch + 1 w ... .34-996 q 



270 Proehloride of copper 1 ch 4- 1 c 12*498 ' 



271 Perchloride of copper 2 ch + I c .... 16*996 s 



272 Proehloride of iron 2 ch + 1 i 16-139 l 



273 Perchloride of iron 4 c h + 1 i ....25-135" 



274 Proehloride of tin 2 c/i + 1/ ... .23-701 x 



four analyses of this compound. According to Davy, it is composed 

 of 100 chlorine + 567" 16 mercury; according to Chenevix, of 

 100 chlorine + 576-14 mercury; according to Berzelius, of 100 

 chlorine + 589*65 mercury; and according to Zaboada, of 100 

 chlorine + 634*22 mercury. The difference between the theoretic 

 result and Davy's analysis is only 2 per cent. The others deviate 

 farther. 



q This makes perchloride of mercury (corrosive sublimate) a 

 compound of 100 chlorine + 277"9 mercury. Now Davy's 

 analysis gives 100 chlorine + 28358 mercury. Chenevix gives 

 100 v.i:loiine + 332-15 mercury : but this result is certainly erro- 

 neous. 



r This is the substance called resin of copper by Boyle, white 

 muriate of copper by Proust, and cuprane by Davy. According to 

 the numbers in the table, it is a compound of 100 chlorine + 

 177*85 copper. Now Mr. John Davy found 100 chlorine + 

 1/7777 copper. 



s This is a yellow powder, which may be obtained by evaporating 

 green muriate of copper on a water bath. According to the table, 

 it is a compound of 100 chlorine + 88*925 copper. Now Mr. 

 John Davy's analysis gives us 100 chlorine + 89*286 copper. 



1 This is a greyish brilliant substance, obtained by heating green 

 muriate of iron to redness. According to the statement in the 

 table, it ought to be a compound of 100 chlorine + 79'402 iron. 

 Mr. John Davy found it a compound of 100 chlorine + 87*16 

 iron; but the analysis was made upon too small a scale to be entitled 

 to confidence. 



u This is a volatile substance, obtained by burning iron wire in 

 chlorine gas, or by heating red muriate of iron. According to the 

 statement in the table, it ought to be a compound of 100 chlorine 

 + 397OI iron. Mr. John Davy found it composed of 100 chlorine 

 54*08 ; but his analysis is not entitled to confidence, from the 

 minuteness of the scale. I consider an atom of iron to weigh 

 7*143, which later experiments induce me to prefer to the weight 

 6-666, given in a preceding part of this table. 



x This substance may be obtained by distilling calomel and 

 amalgam of tin, or by fusing the promuriate of tin. It is grey, and 

 has a resinous appearance. According to the statement in the 

 table, it ought to be a compound of 100 chlorine + 163-46 tin. 

 Now Mr. John Davy's analysis gives 100 chlorine + 164-69 tin. 



