( 1119 ) 
under different circumstances is given in the additional table. This 
table shows that, when the pressure is high, the ionization is always 
strongest in hydrogen, and after that in carbon monoxide, nitrogen, 
air, oxygen. If the pressure in the gas under examination is lowered, 
the proportion changes. Concerning this change may be said that the 
curve representing its character shows in all gases an ascent, slow 
under high pressures and sharper under lower ones. Under very low 
pressures a slight decrease of pressure shows a considerable increase 
of the effect. 
The table mentions the results of the observations made with two 
hydrogen tubes filled at different pressures; further with a carbon 
monoxide, and a nitrogen tube. The first, second, and third columns 
refer to the proportion between the effect measured resp. on hydrogen, 
carbon monoxide and nitrogen, and the effect observed in the two 
other gases the radiation of which has been examined. The fourth 
column gives the proportion between the effect on hydrogen and that 
on air and oxygen. In column N°. 5 are given the absolute values 
of the currents measured in hydrogen. The character and the rapi- 
dity of the increase of the effect with decrease of the pressure in 
the gas may be judged therefrom. The numbers are interpolated ; 
they do not refer to observations made at just the given pressure. 
The conditions in the absorptionroom were always alike; the pressure 
in it was always so low that the active rays were not absorbed. 
ERR ABA 
In the Proceedings of the Meeting of March 25, 1911: 
p. 942 line 17 from the top read: Method. First Part. The Densi- 
meter. 
AMOS Te ee se athome 1 Afethod. .Second Part. The 
Volumenometer. 
ee GOLA i ee es tor “In this: we’, read: ““We’’. 
„ 949 ,, 12 ,, ,, top : for Experimental method, read: 
Course of the experiments. 
(April 20, 1911). 
