COMPOSITION OF CHAMBER DUST. 



713 



ANALYSES XXXIII AND XXXIV. CHAMBER DUST Continued. 



Sational. 



1 The quantitative analysis of the insoluble portion of Analysis XXXIII was only ronghly made, but the qualitative 

 analysis of this portion was done carefully. The bases combined with silica are the same as those combined with silica in 

 the insoluble residue of Anal >-eia XXXIV. 



