34:0 C. Bar us — Effect of Temperature and of Moisture 



metric and electrical curves of an earlier paper (1. c). For the 

 degree of " dryness" reached wholly determines the electrical 

 curve without in the same degree influencing the volume 

 curves, as will presently be further manifest. 



In all cases the dependence of the electrical results on tem- 

 perature remains quite different from the corresponding 

 dependence of the color data on temperature. Special experi- 

 ments made at the end of Table TV with identical apparatus 

 showed strong color activity at 13*6°, viz : blue corresponding 

 to 'SO lit/min. while the subsequent electrical measurements at 

 14° (see Table YI) reproduced the original exceptionally low 

 conductions. 



The position of the phosphorus grid in the tube, ab, of the 

 water bath, figure 1, showed an effect insufficient to be of 

 moment in relation to the phenomena under discussion. Thus 



Rear position, furthest from end a and condenser, (ds /dt) J s =: '13 



(see r, figure 9). 

 Front position, nearest to condenser, (ds/dt)Js = '11 (see/, 



figure 9). 



Nevertheless there is nearly one-third more saturation when 

 the phosphorus grid is nearest the condenser than when remote, 

 a circumstance which, as already intimated, makes it difficult 

 to investigate saturation in this way. Any connecting tube 

 between ionizer and condenser is an absorber, particularly if 

 bent. 



18. Corroborative experiments with the color tube. — A series 

 of experiments were now begun with the steam jet, to ascer- 

 tain the difference between the character of the emanation 

 immediately after the phosphorus grid has been prepared 

 (without preliminary desiccation) and after a large volume of 

 dry air (20 to 30 liters) has been passed over it. If the rela- 

 tively enormous currents obtained in the condenser in the first 

 instance are due to nuclei, there must be a corresponding result 

 in the volume per minute of the saturated emanation neces- 

 sary to produce a fixed color (blue) in the color tube. The 

 reverse is the case, as will be seen in Table Y, where nuclei and 

 ion production are in a measure reciprocal occurrences. In 

 other words, the initial enormous conductions are accompanied 

 by an abstraction of nuclei. 



Three phosphorus strips were as usual dried in press between 

 folds of bibulous paper and then exposed to air for some time. 

 They were then inserted into the tube, ab, of the water bath, 

 figure 1. The initial (apparent) ionization as tested by the 

 condenser was invariably too intense to be measurable. The 

 condenser was then removed and a short tube, G, added to 



