Vol. 6] Ecid: The Elastic-Rebound Theory of Earthquakes. 439 



so low that in August, 1827, at the time of the monsoons, the 

 sea water was driven up the Koree and made the lake brackish. 

 Earlier in the summer it was fresh on account of the floods 

 mentioned below. 



In 1844, Captain Baker, of the Bengal Engineers, made a 

 map and section of this region. "On the 11th of July he found 

 the 'mound' where cut through by the Pooraun (or Koree), 

 nearly four miles in width, but in other places it was said to 

 vary from two to eight miles. Its greatest height was on the 

 border of the lake, above the level of which it rose 20% feet. 

 Prom this elevation it gradually slopes to the northward till it 

 becomes undistinguishable from the plain." 



In 1826 heavy floods caused the Indus to break through the 

 dams and to pour down its former channel across the Bund. 

 Mr. Wynne thinks that if the Bund had actually been elevated, 

 the stream would not have crossed it, but would have flowed to 

 the side. Professor E. Suess accepts Mr. Wynne's explanation 

 and considers that there was no elevation of the Bund, but that 

 "it is simply a case of the eruption of the subterranean water 

 and the consequent subsidence of a sharply defined portion of 

 the muddy ground." 



Dr. R. D. Oldham, having found a tracing of Captain Baker's 

 map and section, which were apparently unknown to Professor 

 Suess, as he does not mention them, concludes, after a review of 

 Mr. Wynne's memoir, that the Bund was actually elevated ten 

 feet at the scarp line with a gradual slope down towards the 

 north and that there was an approximately equal depression 

 immediately south of the scarp. He writes : "On the other hand, 

 and opposed to the arguments which can be urged against an 

 elevation, we have the map and section, and the very definite 

 statement, evidently based on careful leveling, that there was 

 an actual upward slope of the ground immediately behind the 

 southern scarp of the Allah-Bund. There seems, consequently, 

 good grounds for maintaining the older view that the Allah- 

 Bund was an elevated tract, but there can be no doubt that the 

 estimates of its height do not correctly represent the amount of 

 elevation, but of the sum of this and the depression which cer- 

 tainly took place to the south. The former cannot have exceeded 



