1813] Definite Proportions in Chemical Comlinativns. 51 



Hence the blue is a deutoxide, and gives us the number in the 

 table for the weight of an atom of molybdenum. 



1 This would result from Bucholz' analysis of the yellow 

 oxide of tungsten, supposing it a deutoxide ; but the number is 

 not entitled to much confidence. 



' According to Hisinger there are two oxides of cerium, 

 composed of 100 metal and 17*41 and '26-\ 15 of oxygen. Now 

 these numbers being as 2 to 3, we must suppose the first com- 

 pound a deutoxide* Hence the number in the table. 



1 have been obliged to omit the other metals for want of accu- 

 rate experiments concerning their oxides. 



a 2 



