AN ATTEMPT 



TO ESTABLISH 



THE FIRST PRINCIPLES OF CHEMISTRY 



BY EXPERIMENT. 



CHAP. XIII. 



OF THE ATOMIC WEIGHTS OF URANIUM, AN- 

 TIMONY, CHROMIUM, MOLYBDENUM, TUNG- 

 STEN, COLUMBIUM, AND TITANIUM. 



THE seven metallic bodies, which I propose to 

 treat of in this chapter, form compounds with 

 oxygen, which possess rather the properties of 

 acids than of bases. The peroxides of three of 

 them, viz. chromium, molybdenum, and tung- 

 sten, are well marked acids, for they form neutral 

 salts with the bases, which are (several of them) 

 capable of crystallizing. The peroxides of the 

 other four are not so decidedly acid ; but they 

 exhibit a much greater tendency to unite with 

 bases than with acids, and the oxides of tanta- 

 lum and titanium are found native always united 

 with bases. 



VOL. II. A 



