THE STKLFOTURE OF THE NUCLEUS. 



'IWBI,?: I.— EFFECT OF THE TEMPKR.VTURE OF PHOSPHORUS ON ITS EMANA- 

 TION. / = 4-5 cm. ; AIR TEMPERATURE, 27''-28 . WATER RATH 

 METHOD WITH STEAM JET. 



The chief data of the table are reproduced in the chart figure 3, and show the 

 sudden cessation of I'eactiou at 12°-13°. 



4. Discussion.— For the sake of preliminary compaiisons with the correspond- 

 ing electrical charts given below, it is well to lay off \/((lV/dt) in its variation 

 with temperature: for this reciprocal rnns parallel to the concentration of the 

 emanation producing the color. The construction is given in figure 4, in which the 

 sudden rise of activity in producing nuclei is apparent at 13', and the subsequent 

 gradual decline thereafter as far as examined is again manifest. Antici[)ating data 

 of subsequent paragraphs I may add that the maximum ionizing activity is at 20°, 

 showing the two thermal relations to be non-cuiiicident. 



The charts show in the first place, that as temperature falls fi'om the highest 

 admissible values, say 35°, the emanation of phosphorus actually inci'eases,' at a I'ate 

 ' This increase may be due to the gradual thorough desiccation of the phosphorus by the dry 

 current of air. The grids were not dried preliminarily over calcium chloride. 



