THE STliUOTURE OF TKE NUCLEUS. 



17 



la the second part of table 8 the vohxines are nearly constant except at the 

 beginning, where it was foinul impossible to obtain opaque or even full blue, w'hat- 

 ever volume is passed through the ionizer. The necessary number of nuclei was 

 not forthcoming. As in the preceding table, however, less than ten liters of air are 

 sufficient to dry the phosphorus into full activity so far as the color is concerned, 

 whereas the conduction still retains abnormally large values. 



Another i'eci[n'ocal relation is shown on the table. dV/dt here happens to be 

 unusually large, so that the phosphoius is for some I'eason weak as a nuclei pro- 

 ducer. I therefore washed and scoured the surface of the grid, obtaining the usual 

 order of values in the second part of the table. On the other hand, the currents in 

 the fii'st pai-t are larger than those of the second part. Here again, therefore, the 

 tendency to produce nuclei I'eciprocates in intensity with the tendency to produce 

 ions, or better, to produce conduction in the condenser. The latter is facilitated by 

 the pi'esence of ti-aces of moisture, but nuclei are not so produced. 



TABLE 9.— BEHAVIOR OF EMANATING PHOSPHORUS COMPARED WITH DAMP 

 PAPER. TEMPERATURE 17.6°. CURRENT IN CONDENSER, .52 LITERS OF 

 AIR PER MINUTE. INITIAL POTENTIAL DIFFERENCE, .E, = 40 VOLTS. 



Sa = 71. 



