200 DR. A. VERNON HARCOURT ON THE VARIATION WITH 
The experiments (X.-XIII.) do not satisfy the conditions for the constancy of m. 
They are quoted by van’t Hoff, translated by Ewan, 1896, pp. 127-135, and are 
numbered (l), (2), (3), (C). The values of 7)1, the ratio of dk/k to cZT/T are calculated 
at each temperature from the formulae given by the authors. 
X. (l) ‘Influence of the Temperature on the Rate of Decomposition of Dibromo- 
succinic Acid.’ 
The author’s formula is 
log k = '0412^ —a 
or 
log^ = •0412T-6 ; 
hence 
log,/; = •09462T-C, 
and 
m = {k-hlk)/{T-^dT) - ‘09462^ 
f. 
7)1. 
t. 
15 
27-2 
70-1 
32-4 
40 
29-6 
80 
. 33-4 
50 
30-5 
89-4 
34-3 
60-2 
31-5 
101 
35-4 
XI. (2) ‘Influence of the Temperature on the Rate of the Reaction between 
Sodium Chloracetate and Caustic Soda,’ Schwab. 
The author’s formula is 
log k — ‘0404^ —«, 
or 
log, k = ■093T —; 
hence 
7)1 = {k-\lk)J{T-^dT) - - 0931 ; 
t. 
7)1. 
t. 
7)1. 
70 
31-9 
110 
35-6 
80 
32-8 
120 
36-5 
90 
33-7 
130 
37-5 
100 
34-7 
XII. (3) ‘ Influence of the Temperature on the Rate of Change of Chloracetic Acid 
in Aqueous Solution,’ Schwab. 
The author’s formula is 
or 
hence 
log k = « —5202T h 
log,/; = /^-13280T-C 
771 = {k-\lk)/{T-\lT} = 13280T-h 
