146 



A CONTINUOUS RECORD OF ATMOSPHERIC NUCLEATION. 



remainder of January. Leaving the high rain minimum on January 21 (chart 

 9), the cold wave from January 23-26 produces but a small effect, while the 





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Chart io. 



high nucleation on January 2 7 is not foreshadowed by the corresponding march 

 of temperature. 



5. Plate glass apparatus. — Apparatus with plate glass windows was first 



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7 8 9 « // « /3 /4 /5 



Charts ii and 12. 



installed on January 29 and thereafter used permanently. The beginning of 

 February (charts 9 and 10), with its frequent dark fogs and relatively warm 



