NUCLEATION AT PROVIDENCE AND BLOCK ISLAND. 



127 



86. Average daily nucleations. These are given in table 61 , together 

 with the date and the weather. They are further shown in the chart, 

 figure 102, where the abscissas denote the successive days and the 

 ordinates are the corresponding nucleations in thousands per cubic 

 centimeter. The different points are distinguished by the usual 

 Weather Bureau symbols, 3 , r, Sn, etc., so that the weather 

 conditions are included in the curves. 



This curve is quite distinct from the types obtained in 1902-3 and 

 1903-4 and shown in my earlier report,* inasmuch as the new curve 

 has an incidental strongly marked maximum in February. Other 

 features, however, appear as in the earlier figures. Thus, there is a 

 definite tendency to reach a maximum in December. 



* Smithsonian Contributions, Vol. XXXIV, 1905. 



