OF THE EARN AND TEITH. 



151 



by the resemblance of the high banks lying along the river to those already 

 observed at Bridge of Earn. The general aspect of these terraces is well shown 

 in the sketch here given, where a represents the level of the present banks of 

 the river, b an intermediate terrace on the opposite side, and c the high level 

 terrace. This last was obviously a formation similar to what I had seen the 

 previous year. It lay more than 100 feet higher above the sea than that at 

 Bridge of Earn. The only agent holding the same relation to it in both 

 localities was the river, along which lay the steep escarpment and level surface, 

 telling in each case the same story. And again the question presented itself, 

 was not this simply a river formation in both cases % might not the sea have as 



Sketch 1.— Near Crieff. 



little to do with that deposit at the Bridge of Earn as in the neighbourhood of 

 Crieff? I had long felt, however, that much time and attention would be 

 required for the satisfactory examination of these river deposits. Men had too 

 often been content to take a bit here and a bit there from different river-courses, 

 without the continuous examination of any one in particular. If reliable results 

 were to be reached, it seemed that some one of our rivers must be fixed on, 

 followed from the hills to the sea, and made to tell its story from end to end. 

 This was the more apparent on comparing the deposit at Crieff with that at 

 Bridge of Earn. But such an examination demanded more time than was then 

 at my disposal. 



The succeeding season I spent some weeks at Comrie, still higher up the 

 Earn, and there the same deposits again presented themselves in a form which 

 seemed still more to deserve investigation in connection with the carse lands 

 at the mouth of the river. 



I had gone one day to the foot of Glenartney, near Cultibregan, where the 

 Ruchil flows from the hills down on the plain of Dalginross. Looking up the 



