A CONTINUOUS RECORD OF ATMOSPHERIC NUCLEATION. 



excess of a = .005 of residual positive rmcleation over the negative nticleation, 

 and it would follow that the negative nuclei are precipitated faster. But with 

 a leakage in the electrometer of .on and .004 respectively, without any ionized 

 medium, the result is not guaranteed, particularly as the positive leakage is large. 



14. Nucleation partially precipitated. The nucleated air stored over water 

 in the receiver, A, was suddenly cooled and allowed to subside 5-10 minutes. 

 In this way greater chance was given for the differentiation of positive and 

 negative nuclei. The corrected values of a show that positive charge is removed 

 faster than negative charge, by a. = .0010 and .004 respectively, implying excess 

 of negative nuclei. With the insulation varying from .oo3-.oio and .oo3-.oi3, 

 before and after some of the measurements, this result is again doubtful. It 

 should be noticed that it is the reverse of the preceding. 



TABLE 12. RESIDUAL IONIZATION AFTER PARTIAL PRECIPITATION. 

 dV/dt=2.$ LIT./MIN. CHARGE AT 10 VOLTS. 



15. lonization of dry phosphorus nuclei. In the present experiments a 

 dry vessel of 10 liters capacity was introduced between the tower desiccator 

 and the tube, P, figures i and 2. Phosphorus nuclei were now aspirated into this 



