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STUDIES, SCIENTIFIC AND SOCIAL 



the water, and extending for about two-thirds of the total 

 length of the gorge, or nearly half a mile. 



On entering the gorge we are struck by its extreme 

 narrowness, usually not more than six or eight feet, often 



Fig. 23.— thk aarschlucht. 



not more than four, and in some places even less ; its 

 great depth, from 200 to 300 feet, and its remarkable 

 uniformity of width not perceptibly increasing upwards. 

 The sides are cut away in curves or hollows such as would 

 be caused by tumultuous eddying waters ; the walls fre- 



