88 Daltonian Theory of Chemical Proportions. [x\ug. 



Weight of an 

 atom. 



288 Titanium 1S-010 e 



289 Rhodium 14-903 f 



Number of Weight of an 



atom*. integrant particle. 



Oxide of silver 1 s + 1 o ... .14 '714 



Deutoxide of iron . .1 i + 2 o . . . . 9*143 



Peroxide of iron 1 i + 3 o 10*143 



Deutoxide of nickel 1 n + 2 o 9*305 



Peroxide of nickel I n + 3 o . . . .10*305 



Oxide of zinc 1 z + 1 o.... 5*095 



1st oxide of antimony 1 a + 3 o.... 14*249 



White oxide of antimony ....1 a -f- 4 o.... 15*219 



Antimonic acid 1 a -j- Go? . .17*249 



Oxide of tellurium 1 t + 1 o.... 5*027 



Protoxide of manganese 1 m + 1 o.... 8*115 



Deutoxide of manganese 1 m + 2 o.... 9*115 



Tritoxide of manganese 1 ra + 3 o .... 10* 1 15 



Peroxide of manganese 1 m + 4 o... .11*115 



Deutoxide of molybdenum ... I m + 2 o . . . . 8*013 

 Peroxide of molybdenum .... I vi + 3 o . . . . 9*013 



Deutoxide of tungsten 1 t + 2 o.... 14* 121 



Peroxide of tungsten 1 t + 3 o.... 15*121 



Deutoxide of cerium 1 c + .2 o.... 13*487 



Peroxide of cerium 1 c + 3 o.... 14*187 



290 Green oxide of chromium ..Ac + 2 o.... 6*720 



291 Brown oxide of chromium ...1 c + 3 o.... 7*7-0 



292 Chromic acid 1 c + 4 o 8*720 



293 Protoxide of titanium 1 t + 1 o 19*010 



are to each other as one to two. As the brown oxide is interme- 

 diate, we must suppose the green oxide a compound of 1 atom 

 metal + 2 atrnns oxygen, the brown of 1 atom metal + 3 atoms 

 oxygen, and the acid of 1 atom metal + 4 atoms oxygen. After 

 all, I think it must likely that the brown oxide is merely a com- 

 pound of the green oxide and the acid. In that case we must 

 reduce the weight ot an atom of chromium to 2*360. 



e According to Beizelius, from an experiment of Richter. See 

 Annuls of Philosophy, vol. iii. p. 251. 



f Beizelius has shown {Annals of Philosophy, vol. iii. p. 252) 

 that there are three oxides of rhodium. The first, existing in the 

 muriate, is composed of 100 metal + 6*71 oxygen ; the second, of 

 a flea-brown colour, obtained by heat, of 100 metal + 13*42 ; 

 the third, red, obtained by precipitation from soda-muiiate of 

 rhodium, and containing more oxygen than cither of the other two. 



