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POPULAR SCIENCE MONTHLY 



The Same viewed from the Outer Edge of the second Ledge of the Sea-footing. 



just east of the pagoda, and yet now and again the bore swelled np to 

 the wall as it sped along. The southern end, meeting an incline of 

 sand which rises only nineteen feet in a mile and a half, trailed away 

 in a line of very deliberate breakers, which ceased half a mile to the 

 rear of the bore or where it had passed three minutes before. 



A second smaller bore followed directly after the first in the form 

 of a group of secondary rollers on top of the first body of water, and 

 several hundred yards in the rear of the crest behind which for many 

 tens of feet the rushing water was churned into foam by the turmoil. 

 These secondary rollers leaped up from time to time as if struck by some 

 unseen force and disappeared in heavy clouds of spray. These breakers 

 on the top of the flood were sometimes twenty to thirty feet above the 

 level of the river in front of the bore, while the conflict in progress 

 on the river-bed itself was clearly evidenced by the quantities of mud, 

 sand and even large gravel which were seen to be mingled with the 

 surging waters. 



The river filled up to the level of the bore soon after it had passed, 

 but not evenly. 



A quarter of an hour after the bore had passed Haining, the water 

 had risen thirteen feet; after two hours it had risen eighteen feet; and 

 a high-water mark of nineteen feet was attained at 4:45, or after three 

 hours of flood tide. At this time the stream commenced to run out 

 swiftly. At 6 :45 p.m. mean level was reached and at 9 :45 it was 

 practically low water again, though the out-going stream continued 



