THE STRUCTURK OF THE NUCLEUS. 15 



17. Discii-ssion. — The results of tliese tables are shown grai)liifally in figures 

 8 and 9, where the currents (''''•V"'OoAi) ^^'^^ '^^ usual, the ordinates. In a genei'al 

 way, the character of figuies G and 7 has Ijeen preserved, inasmuch as there is 

 maximum ionization at al)t>ut 20°; but the details of behavior are again different. 

 In the first place the scale of the phenomenon is gradually reduced, as the emanating 

 body is repeatedly subject to desiccation. This merely means deficient phosphorus 

 surface, as I w^as not at the time aware how soon phosphoi-us is consumed by slow 

 oxidation in these experiments. 



There is no certain tendency of the maximum to move into smaller temperatures 

 in the later experiments. Thus when J V/dt — .50, nearly. 



Whether the [)hosphorus is being actually consumed, or whether merely a 

 superficial change is in question, will be investigated below; but the charged air 

 current is gradually further removed from saturation and will continue on the 

 decline in the following experiments. Moreover, here is an explanation of the dif- 

 ferences of slope showu in the volumetric and electrical curves of an earlier paper.' 

 For the degree of " dryness " I'eached wholly detei'mines the electrical curve without 

 in the same degree influencing the volume curves, as Avill presently be further 

 manifest. 



In all cases the dependence of the electrical results on temperature remains 

 quite different from the coiTesponding dependence of the color data or temperature. 

 Special expei'imeuts made at the end of table 6 with identical apparatus showed 

 strong color activity at 13.6°, viz., blue corresponding to .80 lit./min. while the 

 subsequent electrical measurements at 14° (see table 6) reproduced the original 

 exceptionally low conductions. 



The position of the phosphorus grid in the tube, ah, 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, (t/s/dt)o/s^ — .13 (see r, figure g). 

 Front position, nearest to condenser, = -i? (see/, figure 9). 



Nevertheless there is nearly \ 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, pai-ticularly if bent. 



18. Corrolonitive experiments ivith the color tube. — K series of experiments 

 were now begun with the steam jet, to ascertain the difference between the character 

 of the emanation immediately after the phosphorus grid has been prepared (without 

 preliminary desiccation) and after a lai-ge volume of dry air (20 to 30 liters) has 

 been passed over it. If the relatively enormous currents obtained in the condenser 



' Experiments wit/i Ionized Air, Chap. V, p. 69. 



