PROPERTIES OF MATTER IN THE GASEOUS STATE. 
751 
high degree of purity, for the gases given off by the india-rubber and the air which 
diffused through it would gradually replace the hydrogen. 
Corresponding pressures with stucco No. 1 and meerschaum No. 3. 
27. Comparing the ratio columns in Tables VIII. and IX. with the corresponding 
columns in Tables VI. and VII. respectively, the corresponding pressures are found to 
be as shown in Tables X. and XI. 
Table X.—Showing the pressures of air for which the ratio of the difference of 
pressure to the mean pressure is the same for stucco No/ 1 and meerschaum 
No. 3. 
Ratio of mean 
pressure 
to difference of 
pressure. 
Meerschaum 
No. 3. 
Pressure. 
Stucco Xo. 1. 
Pressure. 
Ratio of 
corresponding 
pressures. 
inches. 
inches. 
141 
31-0 
5-1 
6*08 
138 
29-5 
5-0 
5-90 
132 
28-5 
4-75 
6-00 
129 
27-5 
46 
6-00 
116 
24-5 
4-0 
6-1 
108 
23-0 
3-7 
6-2 
104 
21-50 
3-5 
6-1 
94 
20-00 
30 
6-6 
99 
19-50 
3-25 
6-0 
85 
18-00 
2-6 
6-9 
90 
17-00 
2-8 
6-05 
72 
12-5 
1-9 
6-5 
70 
11-5 
1-8 
6-3 
57 
8-25 
1-15 
7-0 
59 
7-8 
1-25 
6-2 
44 
5"25 
0-5 
10-5 
44 
4-70 
0-5 
9-0 
37 
3-40 
0-35 
9-9 
38 
3-10 
0-35 
9-0 
29 
2-10 
0-24 
8-5 
32 
2-00 
0-301 
6-6 
27 
1-40 
0-20 
7-0 
27 
1-32 
0-20 
6-0 
5 D 
MDCCG'LXXTX, 
