202 



A CONTINUOUS RECORD OF ATMOSPHERIC NUCLEATION. 



7. Successive monthly data. — The temperature efEect during the remainder 

 of March (charts 13, 14) is rather in opposition to the above inferences for 

 winter. Thus the maximum on March 19-21 corresponds to a hot wave while 

 the other cases are vague. In other words, there is quite apt to be a rise of 

 nucleation wath rise of temperature. The reason for this is frequently to be 

 ascribed to the rain minimum which in winter corresponds to warmer and in 

 spring and summer to colder weather. The Sunday nucleation during clear 

 weather is low on March 15 and high on March 29. The maxima occur for 



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 14 



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Charts 13, 14, 15. 



25 



cloudy (March 17), partially cloudy (March 19-21), and for clear (March 26-29) 

 weather. On March 29-31 the wind and weather change is a complete reversal, 

 and yet the maximum is sustained. Cloud effects appear on March 19, 25, 27, 

 but on the 18th clear weather is inefEective. 



8. Throughout the whole of April (charts 14, 15, 16) the nucleation is 

 moderate. The maximum on April 5-7 clearly corresponds to cold weather. 

 The falling off to the minima on April 14-16 is due to the rain-storm, and the 

 subsequent maximum (April 17-19) has no temperature equivalent. The 

 minima on April 26-27 are cloud effects, the air having been purified elsewhere. 

 Remarkably high rain nucleations occur on April 3-5. Night observations on 

 April 18 show no exceptional values. The cusps on April i, 5, 8, 9, 10, 11, 12, 

 13 18 are peculiar results. 



9. May (charts 16, 17, 18) opens with clear weather but with relatively 

 low nucleation, due probably to the western blizzard. On May 7 and 8 change 



