ACIDIFIABLE COMBUSTIBLES. 



And the atomic weight of tellurium will be ex- 

 actly 4, and that of the oxide 5. 



(2.) Berzelius found that 201*5 parts of fused 

 tellurate of lead contained just the same weight 

 of protoxide of Iqad, which 157 parts of sulphate 

 of lead do.* But 157 parts of sulphate of lead con- 

 tain 115*684 parts of protoxide of lead ; hence, 

 it follows, that tellurate of lead is composed of 



Protoxide of lead 115-684 or 14 



Oxide of tellurium 85-816 - 10-385 



201-500 



To reconcile this experiment with the former, 

 the salt analyzed must have been a bitellurate, 

 or a compound of two atoms oxide of tellurium 

 and one atom protoxide of lead. 



The atomic weight of oxide of tellurium from 

 the above analysis is 5*1925. 



This is rather higher than the weight deduced 

 from the composition of oxide of tellurium, The 

 former experiment being much simpler, and con- 

 sequently, susceptible of greater accuracy than 

 the latter, there can be no hesitation in pre- 

 ferring it, and, consequently, in fixing upon 4 as 

 the true atomic weight of tellurium, and 5 as the 

 atomic weight of oxide of tellurium. 



2. We may deduce the specific gravity and 

 constitution of telluretted hydrogen gas, with a 



* Annals of Philosophy, HI 250. 



