1912-13.] Electrical Resistance and Magnetization of Nickel. 213 
are always negatively greater or positively smaller then the sum H + T. 
The relation is brought out very clearly when the differences are tabulated. 
But since H + T(H) — (H + T) is the same as T(H) — T, and T + H(T) 
— (H + T) the same as H(T) — H, it is simpler to calculate these differences 
directly from Table A and form a new table. The results are shown in 
Table C, in which, however, it has not been thought necessary to give in 
detail the values obtained from the columns 5, 6, 7, and 8. These which are 
associated with transverse fields higher than 400 are so similar that they 
are sufficiently represented by the means of the four sets. 
Table C. — Differences of Changes of Resistance, obtained by subtracting 
H + T from, ( a ), H + T(H) and, ( b ), T + H(T). 
Mean x 
H = 
Mean 
T = 
12 
39 
65 
80 
(90) 
11 
a 
+ 3 
- 15 
- 14 
-15 
-16 
I. 
b 
- 2 
- 6 
-13 
-11 
-13 
24 
a 
- 5 
- 15 
-27 
-37 
-31 
II. 
b 
- 4 
- 5 
-21 
-26 
-26 
38 
a 
— 4 
-23 
-43 
-49 
-57 
III. 
b 
— 7 
-21 
- 35 
-37 
-43 
51 
a 
-18 
-25 
-48 
-56 
-67 
IV. 
b 
- 10 
-23 
-39 
-60 
-56 
60 
a 
-36 
-59 
-76 
-84 
V. 
b 
-40 
-45 
-66 
-72 
63 
a 
- 15 
-45 
-54 
-108 
-93 
VI. 
b 
-22 
-35 
-39 
- 67 
-80 
(1) 
(2) 
(3) 
(4) 
(5678) 
Down the left-hand margin and along the top the mean values of H 
and T are also given, for a reason which will appear immediately. 
It will be seen at a glance that the n-differences and the 6-differences 
follow the same general law of change, increasing numerically as negative 
quantities as we pass from left to right along each row, or from top 
to bottom along each column. A close inspection shows that the increase 
