A CONTINUOUS RECORD OF ATMOSPHERIC NUCLEATION. 



15 



vessel. They were discharged after 5 minutes into the condenser after removing 

 the phosphorus tube. Table 13 shows that almost all the ionization is lost by 

 this dry storage as the excess of leakage due to the discharge of the dry air. 

 through the condenser is a = .ooo and .007, respectively. Thus dry air shows 

 no preservative effect. 



TABLE 13.— RESIDUAL IONIZATION AFTER DRY STORAGE OF PHOSPHORUS 

 NUCLEI.' dV/dt=2.s LIT./MIN. CHARGE AT 10 VOLTS. 



' Intense antecoronal fogs obtained in the exhausted receiver, A, due to back motion of the nuclei into 

 the receiver through the aspirators. 



In table 14, by a modification of the apparatus, a current of dry air passes 

 from the desiccator over phosphorus, and then into one end of a dry vessel of 

 10 liters capacity. At the other end of the vessel the air is continually dis- 

 charged into the condenser. But the usual negative result appears. 



TABLE 14.— DRIED PHOSPHORUS IONS PASSED INTO A DRY VESSEL AND THEN 

 CONTINUOUSLY INTO THE CONDENSER. dV/dl = 2.s LIT./MIN. CHARGE 



AT 10 AND 20 VOLTS. 



16. Inferences. — The chief result of the investigation is the enomiously 

 rapid reduction of the ionization of the phosphorus emanation in contrast with- 

 the persistence of the nucleation. In other words, only a few per cent, of the 



