Lines of no Chemical Change. 431 
above described, except those corresponding to £°=*84 : in 
these (as shown in fig. 2) the reaction-tube was inserted in a 
test-tube containing water and surrounded by melting ice. 
' Our temperatures are corrected for zero error and exposure, 
and refer to the mercurial thermometer. 
In the following Table (I.) we have collected the results of 
our experiments, recording under each group the correspond- 
ing equation. 
Table I. 
] 
Enitialtem- + Avera §' e 
perature. | » 
1 
y- 
Percentage 
strength of 
sulphate. 
1 
X. | 
Cub. cent, 
a-as evolved. 
Time, in 
minutes. 
M 

•68 -82 
•78 ! -91 
•66 j -80 
58-42 
58-22 
57-28 
21-68 
34-34 
79-55 
19 
25 
100 
y =58-706- -010964 x- "000089320 x n - 
-{ 
7-59 
8-68 
8-80 
8-57 1 58-22 1 17*49 
8-74 56-65 54-06 
8-69 | 56-08 1 120-61 
12 
50 
125 
y =59-286- '066776 #+-00033327 x\ 
,,( 
15-78 | 15-80 
15-70 15-59 
15-70 J 15-67 
56-65 
56-08 
54-61 
16-11 
75-88 
155-08 
13 
50 
90 
y = 56-724 - 0-0035633 x - -000064935 
X 2 . 
I 
21-08 
21-11 
21-05 
21-00 
21-08 
21-09 
21-05 
20-96 
56-65 
56-08 
55-98 
54-61 
1-80 
22-42 
28-55 
75-91 
14 
14 
45 
y = 56-718 - -037049 x+ -00038836 x 2 . 
•■( 
26-80 
27-00 
27-18 
26-99 
27-01 
27-12 
54-61 
54-36 
53-86 
37-02 
53-45 
119-45 
16 
19 
60 
y = 55-357 - -023603 #+-000092698 x 
2 
-1 
35-24 
35-33 
35-32 
35-21 
35-25 
35-29 
54-36 
53-86 
53-34 
44-21 
46-52 
6964 
10 
13 
20 
y =79-621 - -90869 x+ -0076292 x 2 . 
VII. J 
43-15 
43-13 
43-03 
4309 1 54-36 | 14-29 
43-16 1 53-86 1 43-59 
43-17 53-34 | 62-64 
^=54-472--0048164ar--00021162j 
5 
7 
8 
VIII. | 
51-57 
51-93 
51-85 
51-62 
51-90 
51-99 
53-86 
53-34 
52-60 
22-03 
28-98 
50-71 
1 \ 
! 5 
y =56-416- -14733 x + -001 4733 x\ 
