XXIX "SCENERY OF SWITZERLAND" 63 



limbs, just in this region you find all intermedians, 

 each on the direct continuation of the other. 



At the time in which the Deltas were formed, indicat- 

 ing a somewhat higher level of the Lake of Ziirich (near 

 PfafFikan), the Walensee was not so high with its level 

 as now. On its ground about 10 to 12 m. below there 

 stands an old wood, the Pinus abies are upright. 



The ground of the wood is just on the same level as 

 the older higher surface of the Lake of Zurich. The 

 lakes of Walenstadt, Ziirich and Constance were 

 (brought ?) all together by the submergence, and they 

 are only separated and the Walensee dammed up by 

 the delta of the South. This delta must have a thickness 

 of at least 140 m. 



Quite the same thing is to be said for the land between 

 Brienzer and Thunner See. The diluvial and alluvial 

 deposit must have at least the thickness = the depth 

 of the lakes. 



I hope I can send to you the next part of your manu- 

 script before the end of this week. I am very sorry that 

 I could not do it more quickly, but I have such plenty 

 of work which must be done that it was quite impossible 

 otherwise. 



Amongst others w^hom he consulted were 

 Professor Geikie, Professor Bonney, Mr. Kenny- 

 Hughes, Mr. Sorby and others. The last had 

 made an elaborate table of the estimated pressure 

 at which the granites were cooled. He admits 

 that the assumption, by no means a necessary 

 one, which he adopted was that the temperature 

 of all was the same. Professor Geikie states that 

 he is by no means disposed to give up the 

 astronomical explanation of the Ice Age. It may 

 be remembered that exception had been taken to 

 Sir John's acceptance of this theory. Professor 

 Geikie states that he still deems that it supplies 

 the best explanation forthcoming of the major 

 climatic oscillations which marked the close of 

 the so-called Glacial Period and refers Sir John 



