290 PEOF. EDWARD HULL^ M.A., LL.D, F.R.S., 



Thus the thickness of the great ice river which filled the 

 valley of the Urner See was about 2,157 feet, being the height 

 of the limit of the erratic blocks above the surface of the lake 

 (namely, 1,500 feet) added to the depth of the lake itself (about 

 657 feet) at the bend of the valley at Brunnen. 



Lord Avebury states that the glacier of the Eeuss extended 

 to Aarau and down the valley of the Aar to Coblenz. On the 

 east it filled the lakes of Egeri and Zug, extending along the 

 Albis to the Uetliberg and to Schlieren on the Limmat, follow- 

 ing the valley down to Coblenz,* Measured from the St. 

 Gotthard, this would be a distance of seventy-five English miles 

 in a straight line ; but measured along its numerous windings 

 it would be probably at least eighty. This length, however, is far 

 exceeded by the old glacier of the Rhone and the Rhine, which 

 almost enclosed the glaciers of the Aar, the Reuss and the 

 Limmat, and had their origin in the same great central mass of 

 the Bernese Oberland. 



Discussion. 



The Chairman. — We are much obliged to Professor Hull for the 

 paper he has read, and although it is short, I have no doubt there 

 are gentlemen here who can supplement it by some remarks on its 

 contents. (The Chairman then called on Professor Logan Lobley.) 



Professor Logan Lobley. — Mr. Hudleston, who is a much 

 greater authority on glacial phenomena than I am, is here, and I 

 should like you to have his remarks first. 



Mr. W. H. Hudleston, F.R.S. — I cannot say that I am much of an 

 authority on glacial phenomena. It is certainly not my special 

 subject. 



I have listened with great pleasure to Professor Hull's paper, 

 which if short is, at any rate, very effective, and gives one a most 

 excellent idea of the interesting phenomena that surround Lake 

 Lucerne. I was so interested when I received this short paper that 

 I ventured to jot down one or two notes which, with your permission, 

 I will read in preference to making a regular speech. I made the 



* The Scenery of Sivitzerland, by Sir John Lubbock (Lord Avebury), 

 p. 130. 



