438 JOHN T. CAMPBELL 



lower (south) mile and a quarter, which showed a decline south- 

 ward amounting to ten inches at the lower (south) end, as shown 

 by the mark on the bur oak and top of the gate walls. I went 

 back to the C. & E. I. railroad bridge at Clinton, two and a half 

 miles above the south end, and started my level from a mark 

 known to be in tally with the level of 1883, and ran carefully 

 over the work again, and it varied from the one made just before 

 only a quarter of an inch. And the bench mark on the bur oak 

 and the top of the gate walls had gone down ten inches (y^V °^ 

 a foot). I was right in 1883 and I am right now. What caused 

 this sink, or subsidence ? I can think of nothing so likely to 

 cause it as the Charleston earthquake. The wave of that earth- 

 quake somewhere south of us changed from westward and went 

 northward along the Wabash. 



John T. Campbell. 

 RocKVJLLE, Indiana, 

 July 20, 1 90 1. 



