506 
Proceedings of Royal Society of Edinburgh. [sess. 
obtained. In calculating the mean constant in each series, it was 
necessary, as already stated, to assign to each individual constant 
its own “ weight,” which varies very much in the different experi- 
ments. It was found in the following manner. An experimental 
error of 1 per cent, was assumed in the velocity constant, and the 
corresponding percentage difference produced in K was calculated. 
The “ weight ” given to each constant was the reciprocal of this 
number. 
In the following tables is shown the value of K calculated from 
each experiment by the above formula, the “ weight ” assigned to 
each, and the probable value of K for each series. 
First Series. 
h 2 so 4 
k 2 so 4 
K 
“ weight” 
K x “ weight 
0*025 + 
0-1 
0-311 
0*345 
0*1073 
0-05 
0*310 
0-282 
0-0874 
0*1 
9 9 
0*316 
0*197 
0-0623 
0-2 
9 9 
0*383 
0-116 
0-0444 
0-35 
99 
0-396 
0-070 
0*0277 
1*010 
0*3291 
7 c 0*3291 
Mean value of K — - 
= 0*326. 
Second Series. 
h 2 so 4 
k 2 so 4 
K 
“weight” 
Ivx “weight 
6 -i + 
0-4 
0*298 
0-497 
0*1481 
) 9 
0-2 - 
0*276 
0*345 
0*0952 
9 9 
0*1 
0*316 
0197 
0-0623 
9 9 
0-05 
0*392 
0*096 
0*0376 
99 
0*025 
0*448 
0-045 
0*0202 
1-180 
0*3634 
Mean value of K = 0*308. 
Third Series. 
h 2 so 4 
k 2 so 4 
Iv 
‘ ‘ weight ” 
Kx “weigl 
0*2 -f* 
0*2 
0*290 
0-242 
0*0701 
0*15 
0-15 
0*316 
0-225 
0*0711 
0*1 
0*1 
0*316 
0*197 
0-0623 
0*05 
0-05 
0*446 
0-102 
0-0454 
0-025 
0-025 
0*539 
0-074 
0-0398 
0*840 
0*2887 
Mean value of K = 0*342. 
The mean value of K for all three series is 0*325, the greatest 
difference between this and any of the mean values for each series 
