792 
MR. BRODIE ON THE CONDITION OF CERTAIN ELEMENTS 
also the same kind of progressive increase of loss, as already observed with the chlo- 
ride; the increase however is not so constant. In experiments 4 and 5 exactly half 
the oxide is reduced ; the ratio of the oxygen in the oxide of silver taken, to the 
oxygen from the oxide reduced, being in the two experiments as 100: 5 1*2 and 
100 : 49*31 ; the presence however of carbonate of silvei* in the oxide renders this fact 
less certain than the similar fact observed in the case of the chloride of silver 
(Table I.). 
I repeated these experiments with another preparation of the peroxide, the peroxide 
O, containing 7'57 pei‘ cent, of oxygen; 3*12 grins, of oxide of silver are equivalent 
to 3 grms. of this peroxide. 
Table VI. — A. 
Peroxide of 
Oxide of silver. 
Chloride of silver 
Equivalent of 
barium 0. 
obtained. 
oxygen. 
1. 
3*0666 grms. 
2-737 grms. 
1-692 grms. 
0-094 grms. 
2. 
3-006 
3-659 
1-7146 
0-0952 
3. 
3-098 
4-801 
1-7335 
0-0963 
4. 
3-007 
5-426 
2-0735 
0-1151 
5. 
3-0806 
11-592 
2-5123 
0-1395 
Table VI.- 
-B. 
Oxygen in the 
Oxygen of the 
peroxide of 
oxide of silver 
Ratio, a : if. 
Calculated ratio. 
barium 0=a. 
reduced = •>/'. 
1. 
3-09 
2. 
3-16 
5:2 
3-02 
3. 
7*57 
3-10 
4. 
3-85 
2:1 
37-8 
5. 
4-52 
5:3 
4-74 
Table VI.- 
-c. 
Oxygen in the 
Oxygen of the 
peroxide of 
oxide of silver 
Ratio, a : if. 
Calculated r..tio. 
barium 0=a. 
reduced = ■'!'. 
1. 
40-81 
2. 
40-74 
5:2 
40-00 
3. 
100 
40-95 
4. 
50-59 
2 : 1 
50-00 
5. 
59*70 
7:3 
60-00 
The experiments 1, 2, 3 here correspond to the experiments 6 , 7, 8, 9 in Table V. ; 
they give however a considerably greater loss, the ratio being 5 : 2 instead of 3 : I. 
This difference, it is probable, extends also to the higher terms in the series, for we 
