12 



THK STUUtrrUKE OK THE NTTCLEUS. 



tion traversing the coiulenser, ai'e a nearly constant quantity in view of the second 

 stopcock already mentioned, d is the temperature at which the fall of potential, 

 d^/dt was observed, a being the deflection in scale parts of the electrometer iised 

 above. The condenser was given a positive and a negative charge alternately, with 

 the outer face put to earth. Four readings for the negative charge were included 

 between similar sets for the positive charge. The conduction of the insulators is 

 given. The last column contains the datum x = — (ds/dt)o/So. 



TABLE 5.— ELKCIRICAL CURRENTS IN THE CONDENSER, WITH THE MEDIUM 



IONIZED BV PHOSPHORUS, AT DIFFEREN I' TEMPERATURES. 



£ti = 41 VOLTS ; s^ = 73. 



14. /Hsctission. — The initial currents (a?) are shown in the graph, figure 7. 

 As a whole the results are much more definite than in figure 6, seeing that no 

 reduction for volume differences is now needed. Thougli there is a small differ- 

 ence between the currents corresponding to the positive and the negative charges, 

 this difference lies within a scale part and may be taken as an error of observation. 

 The position of the maximum of nuclei is again shown at c. The range of the new 

 data, after deducting the enor in insulation, a? = .18, is smaller than above, x = 21, 

 a circumstance presently to be considered and attributable to moisture and leakage 

 errors, or in general to the necessai'ily unsatui-ated condition of the ionization within 

 the condenser. 



Moreover, the form of figure 7 differs from figure 6 and has approached more 

 nearly to the color results of figure 4. The maximum, however, is still near 20°, 

 so that the inferences above on the earlier api)eaiaiice of the nuclei and the 

 generation of the ions out of the nuclei, is sustained. 



15. Permanent conduction frodxiced by the emanation. — At this stage of my 

 woik, I encountered a peculiar and puzzling series of phenomena which were not 

 noticeil in my earlier work, ]iiol)al)ly because the room temperature was jturposely 

 kept high and the atmosphere dry. After the air was passed over pho-sphorns 

 freshly jiut into the tube a/f, figure 1, tlie condenser receiving the emanation was 

 thereafter found to remain permant??itly cowiucting even with the air curient shut 

 off, precisely as though it had itself become radio-active. This conduction was 



