DR. A. SCOTT ON THE COMPOSITION OF WATER BY VOLUME. 
565 
2. For the probable value of the result from several series of experiments 
iAI = 
A B C „ 
B - &c. 
a- 0- c“ 
11 ^ 1 . 
«- 0" C“ 
M = general mean. 
A, B, C, &c., being the mean results as above. 
a, I), c, &c., being the probable error of each. 
3. For the probable error of this general mean = m 
1 
These mean values are for 
Senes I. 
Number 
of experiments in 
eacb sub-series. 
Impurity equally 
in both gases. 
Number 
of experiments. 
Impurity all in 
hydrogen. 
Ib. 
(2) 
1-9976 ±-001 
(2) 
1-9975 ±-001 
Ic. 
(2) 
1-9990.5 ±-0001 
(2) 
1-9988 ±-00006 
Id. 
(4) 
1-9985 ±-0007 
(4) 
1-9982 ±-0007 
1e. 
(6) 
•2-00011 ±-0004 
(6) 
2-00055 ±-0005 
If. 
(5) 
2-0014 ±-00005 
(5) 
2-00104±-00018 
General mean for 
Series I. 
(19) 
2-000903±*00004 
(19) 
l-999-25±-00005 
Series II. 
Number 
of experiments in 
each sub-series. 
Impurity equally 
in both cases. 
N umber 
of experiments. 
Impurity all in 
hydrogen. 
IIa. 
(19) 
2-0020 ±-00024 
(19) 
2-0019 ±-00024 
IIb. 
(^) 
2-0038 ±-0062 
(7) 
2-0037 ±-0060 
He. 
(10) 
2-0015 ±-00036 
(9) 
2-0016 ±-00036 
IId. 
(-5) 
2-0030 ±-000-22 
(5) 
2-00.30 ±-00022 
He. 
(12) 
2-00245 ±-00007 
(12) 
2-00245 ±-00007 
General mean for S 
ei'ies II. 
(5.3) 
2-002435 ±-00006 
(52) 
2-002431 ±-00006 
