602 Mr Lamplougli, On the determination of the rate of 
For example, in one of the two experiments at 62°, an evolution 
of 651 c.c. of nitrogen was measured when the liquid was stirred. 
In the other experiment, without agitation of the solution, 562 c.c. 
were given off, and on completing the evolution of gas by the final 
stirring a further volume of 31 c.c. was obtained, making 59’3 c.c. 
in all. This amount is 5’8 c.c. less than that given off in the 
former experiment, and therefore in plotting the results of the 
second experiment the starting-point must be that point on the 
first curve which represents an evolution of 5‘8 c.c. of gas, this 
volume being added to all the measurements of the amount of gas 
evolved ; and since the 5 - 8 c.c. of gas were evolved in ‘20 min. all 
the time measurements must likewise be increased by '20 min. 
In the following tables are given a few of the original readings 
taken in the two experiments. 
Diazobenzene Chloride. 762 mm. 62° C. 
The reaction mixture was kept in thorough agitation by stirring. 
c.c. 
minutes 
c.c. 
minutes 
0 
04)0 
40 
2-04 
6 
0-22 
46 
2-68 
12 
0-45 
52 
3-53 
18 
0-70 
58 
4-88 
24 
1-00 
62 
6-73 
30 
1-36 
64 
8-75 
34 
1-58 
65 
11-85 
Diazobenzene Chloride. 762 mm. 62° C. 
Volume of solution 37 c.c. 
The reaction mixture was allowed to remain at rest. 
c.c. 
minutes 
c.c. 
minutes 
0 
o-oo 
26 
3-17 
1 
0-55 
34 
4-33 
2 
0-75 
40 
5-60 
3 
0-92 
46 
7-70 
4 
1-03 
51 
11-60 
8 
1-45 
54 
16-80 
14 
1-97 
56-2 
25-50 
20 
2-53 
59-3 
after stirring 
