NUCLEATION AT BLOCK ISLAND. 



109 



Taken as a whole, therefore, it seems to me probable that some- 

 thing more than the displacement of a land effect, produced artificially 

 and locally elsewhere, chiefly by combustion, has been observed. In 

 other words, it would be premature to attribute the phenomena as a 

 whole to atmospheric convection. 



TABLE 58. Average daily nucleations of the atmosphere at Block Island, 1904-5. 



81. Average daily nucleations at Block Island. The mean variations 

 of the nucleation at Block Island from day to day are given in table 

 58, and they have been already charted in figures 91 and 92. The 



