A CONTINUOUS RECORD OF ATMOSPHERIC NUCLEATION. 



2I 5 



of nuclei per cubic centimeter. Incidental disturbances will thus be to some 

 extent removed at least from the latter, so that the sweep of nucleation through- 

 out the year may be more clearly apparent. The rain effect will be more uni- 

 formly distributed during the summer months, though it cannot of course be 

 eliminated. 



The data for the mean daily nucleations are given in Table III, and require 

 but little explanation. The symbols for the state of the weather have been 

 abbreviated, f denoting fair, f slightly cloudy, c' partly cloudy, c cloudy, R' 

 slightly rainy, R rainy, etc. Sn refers to snow, Sn' to a light snow. 



TABLE III. 

 MEAN DAILY NUCLEATIONS FROM OCT. 2, 1902, TO NOVEMBER i, 1904. 



