BORON AND FLUORINE. 



43 



the final value (though obviously incorrect) would have been in 

 excellent agreement with the present value (11.0). 



It should be borne in mind that the samples of "borax glass" 

 represented in this table had not been dehydrated in one lot; 

 they were taken from three different lots which had been dehy- 

 drated separately. Unfortunately the weight of the "borax 

 glass" was not determined in experiments v, vi, vn, and vm, as 

 the true significance of the residual water was not fully realized 

 at first. However, we have little reason to doubt that these 

 samples of borax glass would have shown approximately the same 



TABLE 2. 1 



1 Experimental data taken from table 1. 



percentage of moisture (cir. 0.2 per cent.) as the other portions. 

 As the braces in table 1 indicate, it was (strictly speaking) only 

 in experiments vi and vn that the residual water was not deter- 

 mined at all. The percentage of water in the borax of experiment 

 xi is somewhat lower than that in the preceding sample, probably 

 because (before it was transferred to the bulb) it had been re-fused 

 in the crucible in which the preliminary dehydration of the crystals 

 had been carried out. 



The full significance of table 2, particularly of the last column, 

 may be gathered from the discussion of Ramsay and Aston' s 

 determinations in Chapter III (p. 57). 



4 



