206 



A CONTINUOUS RECORD OF ATMOSPHERIC NUCLEATION. 



15. In November (charts 29, 30, 31) the cold wave on the 7th has no 

 counterpart in the nucleation, which is throughout nearly uniformly high. A 

 ctu-ious result is the unexplained minimum on the nth for clear weather, much 

 below the rain effect. After November 22 the sweep toward cold weather on 

 November 27 shows itself in the nucleation. The cold snow on November 29 

 has but slight, if any, denucleating tendency. 



16. So in December (charts 31, 32, ^^) the precipitation on the 2d and 3d 

 scarcely reduces the nucleation, and this remains high except during the rains 

 of December 9 and 13. The clear weather minimum on the 8th is noteworthy. 

 From December 10 to the rain-storm of December 21, the temperature effect is 

 very sharply marked, as appears particularly in charted data. The same is 

 true for the remainder of the month. On December 26, 27, 28, precipitation of 

 snow below the freezing-point actually raises the nucleation. 



17. Successive monthly data for 1904. — With the beginning of the new 

 year, 1904, and very cold weather (charts 7,;^, 34, 35), there is striking parallel- 

 ism between the temperature curve and the excessively high nucleation, as far 

 as the minimum introduced bv the thaw and wet snow on the 9th. The con- 



