A CONTINUOUS RECORD OF ATMOSPHERIC NUCLEATION. 



207 



trast between the negligible dr}' snow effect on January 2 and the wet snow 

 minimxim on January 9 is to be noted. The maximtuTi reaches its height (the 

 diffractions actually surpassing the large green-blue-purple corona) during the 

 cold blizzard and snow drift of January 3 . As the coronal method breaks down 

 for nucleations exceeding the case for the g-b-p corona, the higher nucleations 

 are merely suggested in value on the charts. There is a fog effect on January 

 7. Moreover, the maximum is well sustained while the winds shift from north- 

 erly to southerly on January 6. 



£Jan, 7 



iz — n n — ^ 



Charts 33, 34- 



After the rains on January 13 and 16 a second march of nucleation into 

 extremely high maxima (January 1 8-2 1 ) coincides with the sweep of very cold 

 weather, ultimately to be broken by the wet snow on January 2 1 . During the 

 remainder of the month there are some suggestive data on the nucleation ac- 

 companying a strong fog, though but few of the active nuclei are probably 

 entrapped in the latter. Cold snow effects on January 26 and 29 may be noticed. 



18. February (charts 35, 36, 37) begins with a sweep of cold weather and 

 high nucleation, terminating in the thaw and fog of the 7 th. The next cycle 

 extends to the snow on the 14th, a low minimum, remarkable as being below 

 freezing. The temperature effect from February 1 2-14 is obscure. High nuclea- 

 tion again prevails until the rain and thaw on February 2 2 . The large number 

 of observations entered are due to a number of subsidiary experiments made 

 during this interval. There is cold snow on February 15 and 19. Even the 

 dense snow-storm on February 24 only partially removes the nucleation, as this 

 falls off gradually into the minimum following the rain of February 29. 



