390 GILLIGAN : EFFECTS OF STORM ON BARDEN FELL. 
thunderstorms remain within the mountain district in which 
they originate, they break up towards evening, and are followed 
by a clear night." 
The weatlier chart for June 3rd, 1908, shows a disturbance in 
the Bristol Channel, and a terrible thunderstorm is recorded at 
Bristol, accompanied by deluging rain. This may in part account 
for the storm at Bar den, as the disturbance travelled nortli- 
eastward. 
The great amount of material which was carried down by 
the storm on Barden Fell makes one realise vividly; the mechanical 
power which water possesses as a denuding agent. The quiet 
work of the streams and rivers of the world is great, but no 
doubt storms aid them in their destructive work more than we 
are accustomed to imagine, bringing down the material from 
the higher land in such a form that the river can easily transport 
it. 
The torrential rains of the tropics must do enormous work ; 
for instance, those which occur at Cherrapongee, in the Khasia 
Hills of Assam, where 40 inches have been known to fall in one 
day and 800 inches in the year, the bulk of the rainfall occurring 
during the prevalence of the south-west monsoons, from June 
to December. 
My thanks are due to Miss M. Phillip, Embsay, and to 
Dr. Dwerryhouse for permission to use the photographs illus- 
trating this paper, and also to Mr. G. V. Wilson for his help 
in the field. 
