192 EF. Leininger: Relation of Electric Charges transported 
the rays could be observed with gradually decreasing pressure 
and increasing potential of discharge. 
For the evolution of the gases—oxygen and hydrogen—in 
a state of purity, the arrangement employed by Prof. W. Wien, 
and described in his second and third memoirs on the electrical 
discharge in rarefied gases, was adopted *. 
Observations. 
The results embodied in the following Tables were all 
obtained by the aid of the tube shown in fig. 2 (p. 182). 
The distance of the collecting from the neighbouring 
electrode was 4 cms. in all the experiments, partly in order 
to render the values comparable with former observations, 
partly in order to avoid the disturbances which were in 
general called into play by a nearer approach of the collector. 
TABLE V. 
Cathode rays in oxygen. Second kind of net-electrodes, 
Value of ‘ nahodaageal 
parental ne rays 190 pethede mays | Ee current a 
in 100 s¢ Leones weve current | | correctadden 
yolts. current — corrected for 
absorption by net. absorption by net 
and reflexion. 


300-—500 2326 4-3—5:05 6-05—7 
700 45 87 12 
1000 67 12:9 17-9 
1200 85 16-4 22:8 
1400 10°5 20:2 28:14 
1600 13 25-1 34:8 
1800 15-2 29:3 | 40:7 
2000 17-5 337 | 46-9 
2400 20°5 39:5 54:9 
2800 94-5 47°3 65:7 
3000 26:7 515 716 
3400 285 55 765 
4000 294 567 78:8 
5000 31 59:8 83-1 
6200 32 61-7 85'8 
7000 33:1 63-9 88:7 
7800 34:6 66:8 92:7 
| 
| 

The values of the canal and cathode rays in hydrogen 
and oxygen, corrected for the absorption by the net and the 
reflexion of the cathode rays by the collector (28 per cent. 
in the case of aluminium), are given in Tables V. to VIII. 
It may, however, be pointed out at once that the correction 
* W. Wien, Ann. d. Phys. v. p. 428 (1901) ; vill. p. 256 (1902)" 

