

DIAGRAM No. I., SHOWING THE NUMBER OF DUST PARTICLES IN THE ATMOSPHERE AT BEN NEVIS OBSERVATORY AND K1NGA1RLOCH 



DURINC JULY 1891. 



Trans. Roy. Soc. Edin. Vol. XXXVII 



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The Thin Lines show the number of Partioles at Ben Nevia Observatory. 

 The Thick Lines show the number of Particles at Kingairloch. 



The Upper Arrows show the Direction and Force of the Winds on Ben Nevis. 

 The Lower „ „ „ „ at Kingairloch. 



The Intermediate „ „ „ „ over the British Isles. 



