128 NUCLEATION OF THE DECONTAMINATED ATMOSPHERE. 



TABLE 62. Average monthly nucleations. 



:; ' The February effect, which is merely superimposed at Providence, becomes 

 fundamental at Block Island. The ratios show that it outlasts March and even April. 







JI60. Set. Jo*,. & Jk&r. Jjpr -% June, % % JSeft. Oct. J\ f *J. 



FIG. 103. Average monthly nucleations at Providence in thousands per cubic centi- 

 meter from October, 1902, to May, 1905. The lower curve shows corre- 

 sponding results taken at Block Island. 



87. Average monthly nucleations. The properties of the new curve 

 just referred to appear more obviously if the monthly averages are 

 drawn in their dependence on time, as is done in table 62 and in 

 figure 103. In the latter the data for 1902-3 and 1903-4 are included, 

 the points of the different curves being suitably distinguished. The 

 tendency to reach a maximum in December appears in all these curves, 

 but the curve for 1904-5 departs from them in its pronounced march 

 toward the duplicate maximum in February, after which, however, 

 there is clear agreement between the 1903-4 and 1904-5 curves, neither 

 of which falls to the low nucleations for March, April, etc., in 1902-3. 



