86 
SOME PRINCIPLES AND METHODS OF BOCK ANALYSIS, [bull. 176. 
The following tables contain the results of a considerable number 
of tests, those in Table II being tabulated separately in order to show 
the degree of accuracy attainable with a large excess of chromium by 
applying the correction above mentioned and also the amount of this 
correction : 
Table I. 
Tests for vanadium in the presence of chromium. 
No. 
Chromic 
oxide. 
Vanadium 
pentoxide. 
Vanadium 
pentoxide 
found. 
Error. 
1 
Milligrams. 
Milligrams. 
Milligrams. 
Milligram. 
1 
1 
9.87 
9.22 
-0. 15 
2 
1 
.94 
1.04 
.98 
+ .10 
+ .04 
3 
1.5 
5.25 
5.49 
5.43 
+ .24 
+ .19 
4 
2 
5.62 
5.5 
5.5 
— .12 
- .12 
5 
3 
4.68 
4.78 
4.78 
4.83 
+ .10 
+ .10 
+ .15 
6 
3 
5.62 
5.58 
5.58 
- .04 
- .04 
7 
3.5 
18. 74 
18.89 
18.97 
+ .15 
4- .23 
8 
6 
5.6 
6.1 
+ .50 
9 
6 
4.68 
4.78 
+ .10 
10 
6 
5.62 
5.58 
- .04 
11 
10 
5.62 
5.58 
- .04 
12 
10 
23. 52 
23.81 
23.71 
4- .29 
+ .19 
13 
10 
46.85 
46.98 
47.20 
+ .13 
+ .35 
14 
25 
23.52 
23.65 
23.75 
4- .13 
+ .23 
16 
87.5 
23.52 
23.71 
+ .19 
