138 A CONTINUOUS RECORD OF ATMOSPHERIC NUCLEATION. 



With regard to atmospheric nucleation, it seems to me, in addition to the 

 remarks made in i , that the variety and importance of the phenomena which 

 are now attributed to the invasion of solar and cosmical dust into the atmos- 

 phere, such as certain variations of atmospheric pressure, of atmospheric elec- 

 tricity, of terrestrial magnetism, of auroral display, etc., induce one to wonder 

 why continuous and systematic records of atmospheric nucleation, other than 

 the series obtained at Ben Nevis during the period when Aitken's observations 

 gave to the subject widespread interest, have not long since been included 

 among the records of observatories. Surely in discharging its remarkable and 

 varied ccsmical functions, this dust from afar, if at all persistent, must some 

 day be detected undisguised. 



