chemical change hy measurement of the gases evolved. 587 
Temperature 36°. 
Volume of gas 
evolved, c.c. 
Time, 
minutes 
Velocity 
constant 
0 
0-00 
2 
0-69 
•0065 
5 
1-75 
•0065 
10 
3-56 
•0064 
20 
7-32 
•0064 
30 
11-32 
•0064 
40 
15-31 
•0065 
50 
19-64 
•0065 
60 
24-41 
•0065 
70 
29-56 
•0065 
80 
35-10 
•0065 
90 
41-18 
•0065 
100 
47-72 
■0065 
110 
55-05 
•0065 
116 
59-90 
•0065 
196 
Calculated end 
point 
Mean -0065 
Temperature 44° '3. Temperature 51° - 4. 
Volume, 
c.c. 
Time, 
minutes 
Velocity 
constant 
Volume, 
c.c. 
Time, 
minutes 
Velocity 
constant 
0 
0-00 
0 
o-oo 
4 
0-69 
•0194 
2 
0-17 
•0509 
12 
2-10 
•0198 
8 
0-72 
•0501 
20 
3-66 
•0195 
16 
1-47 
•0514 
30 
5-66 
•0198 
26 
2-49 
•0524 
40 
7-93 
•0198 
34 
3-47 
•0519 
50 
10-50 
•0197 
42 
4-57 
•0516 
60 
13-40 
•0197 
50 
5-87 
•0511 
70 
16-70 
•0196 
58 
7-37 
•0523 
80 
20-47 
•0197 
66 
9-22 
•0506 
90 
25-16 
•0198 
74 
11-47 
•0508 
100 
31-10 
•0198 
86 
16-87 
•0503 
110 
39-04 
•0199 
94 
24-00 
•0503 
116 
45-75 
•0200 
98 
32-90 
•0504 
118 
48-60 
•0201 
99 
37-70 
•0510 
132 
end-point, 
calculated 
Mean -0198 
100-2 
end-point, 
observed 
Mean '05 1 1 
In order to determine what law represents the relation between 
the rate of reaction and the amount of diazo salt left undecomposed, 
