OF GASES UNDER THE BECQUEREL RAYS. 
515 
(2.) Air. Pressure 123 millims. 
30 scale divisions in— 
66‘5 64*5 63*5 65 66 seconds. 
Mean 65*1 seconds. 
Hydrogen pressure 696'5 millims. 
30 scale divisions in— 
72-5 74-5 73-0 75-0. 
Mean 73*75 seconds. 
Conductivity of hydrogen ggg.g ^ = ‘156 (air = 1). 
(3.) Hydrogen. Pressure 347 millims. 
30 scale divisions in— 
137 133 134 132-5. 
Mean 134-1 seconds. 
Air pressure 129*3 millims. 
30 scale divisions in— 
57-5 57 58-5 58. 
Mean 57*75 seconds. 
Conductivity of hydrogen = 347 ~ = !)• 
We have then as the results of these three determinations— 
Conductivity of hydrogen *154, *156, *161. 
The final mean value being *157. 
The results for the other gases will now be given in a tabular form, since no good 
purpose would be served by writing them out at full length. To make the table 
complete, the results for hydrogen will be repeated. 
Nature of gas. 
Relative conductivity (air = 
= !)• 
Separate determinations. 
Mean. 
Hydrogen. 
•161 
•154 
•156 
•157 
Oxygen . 
1-22 
1-23 
1-28 
1-21 
Hydrochloric acid. 
1-48 
1-52 
1-38 
1-46 
Carbonic acid. 
1-61 
1-57 
1-54 
1-57 
Cyanogen . 
1-82 
1-81 
1-84 
1-82 
Sulphurous acid. 
2-35 
2-33 
2-27 
2-32 
Chloroform. 
4-83 
4-98 
4-87 
4-89 
Methyl iodide. 
5-22 
5-33 
4-98 
5-18 
Carbon tetrachloride .... 
5-93 
5-78 
— 
5-85 
3 u 2 
