342 WAVES OF THE SEA 



of the Winds, behind the falling sheet of water, 

 found that the barometer pulsated. The cones in 

 the American Falls appeared to follow one an- 

 other in swift succession, but in watching the fall 

 of the water of the Tschingelbach, at Burglauenen, 

 near Grindelwald, Switzerland, May 22, 1904, 

 where the cones were very perfect, but the 

 volume of water small, I concluded that the 

 apparent swiftness at Niagara was due to the great 

 number of cones passing confusedly. So also do 

 snow-flakes seem to pass the eye rapidly when 

 we look through a long column of air, standing out 

 of doors, but if we watch from the interior of a 

 room, so that no flakes pass close to the eye, it is 

 seen that for the most part they are subsiding 

 slowly through the air. 



The conclusion was confirmed when I next 

 viewed the Tschingelbach Fall. The amount of 

 water was then much diminished, and the fall was 

 coming down in several separate threads of water 

 instead of in a broad sheet. The cones in each 

 of these threads of falling water followed one 

 another in an orderly and unhurried manner, 1 the 



jjjfa: iwu. 



1 In a narrow waterfall at Isetwald, on the Lake of Brienz, I 

 saw the cones, which were close together near the commence- 

 ment, become widely separated as their velocity increased under 

 the action of gravity. 



