of Air by Phosphorus. 48? 



tube. Again, U>A*, though presumable from the earlier 

 work, is strongly negatived here. 



Moreover, the variability of the slopes #/V, observed for 

 the different series, 1 to 4, clearly with an inherent cause, 

 since the slope for a given series is determinate, is additional 

 evidence in this direction, as will presently appear. 



In a colour-tube left entirely without disturbance, the colour 

 must depend on Vn, the total number of nuclei entrapped. 

 Thus the colour may be reckoned as Yn = Vn €~ Jj/v . The 

 same colour should appear if Yn=V'ti'= const., if the satu- 

 ration decreases as the volume supplied increases. The ratio 

 of the electric current in the condenser, or preferably the 

 conduction, x, of the ionized medium to the colour constant is 



, V /Vn = 434U e (e L v - 1 )/kG (r, - rj , 



which is independent of the initial saturation n , but varies 

 with V. Thus although two volumes, V and V, produce 

 the same colour (Vn = VV), they will nevertheless correspond 

 to different conductions, &\ Hence the variable slopes of tig. 3 

 for the different series. There is, however, an outstanding 

 difficulty requiring further observation ; for singularly enough, 

 the volumes alone appear to determine the colours in the chart 

 rather than the quantities Vn. 



Solid conductions and other leakages were not found in the 

 tests made, in quantity to be menacing. 



11. The Number of Particles. — The probable explanation of 

 the discrepancy (leaving the ratio XJ/k in abeyance) is that 

 the value ?2 u = 4xl0 10 inserted, is too large; for the ema- 

 nation within the condenser is not saturated to begin with. It 

 enters and leaves unavoidably from a certain length of influx 

 tubulure, c in fig. 2, insuring absorption at the outset. Un- 

 fortunately my notes do not supply the details of adjustment, 

 as I did not suspect their importance at the time. But if 

 they did, the loss at the elbow at both ends of the con- 

 denser would remain as a vague but definite cause of ion 

 dissipation. 



On the other hand, the value of tt which the observations 

 demand is easily computed from the observed values of 

 t y/V = 2tU', nearly; and from these very satisfactory inferences 

 may be drawn. 



Solving, therefore, 



_ WVjtCQ-.-r,) 



where as before U=& may be assumed for orientation. 



2K2 



