62 LIFE OF SIR JOHN LUBBOCK oh. 



The foliation can be a cleavage by pressure in another 

 direction, for instance by mountain-making, then its 

 direction is not necessarily the same as the direction of 

 the stratification ; it may disturb the stratification of the 

 older primary foliation in some cases, in other cases 

 adds itself to the first. 



A great deal of the gneisses were Felsporphyrs and 

 Granites, which have got their foliation by pressure — 

 so also the Protogines. Most of the granites in the 

 Alps have got some foliation by pressure, and have 

 become Gneisses or Protogines. Only those which 

 were very resistant and surrounded with weaker material 

 have conserved their primary structure, as for instance, 

 the granites of Albula silver, and in some cases the 

 gneiss foliation may be fluidal texture of a granite. — 

 Believe me, yours very sincerely, Alb. Heim. 



And again Dr. Heim writes : 



The Lake of Geneva has its greatest depth — a 

 horizontal plain — between Morges, Evian, Tourroude 

 and Lausanne. The greatest depth = 309' 4 m. lies in 

 a line between Lausanne and Evian in the middle of 

 the lake. The surface of the Lake of Geneva is 

 582 km.2 + 36 hectaren.^ 



The quantity of water which it contains is 

 88,920,664,000 m.^ The research has been made for 

 the Swiss part by Ing. Hornlimann, for the French 

 part by Ing. Delebecque. 



In the sequence of strata on the Glarnisch one finds 

 some middle limbs squeezed out into a very thin dis- 

 appearing sheet with thrust striated surfaces. On the 

 Silvern, which is the continuation, the squeezing out 

 did not go so far, and the bendings are not removed, but 

 easily to be seen. These are all intermedians between 

 overfold and overthrust — the begrinding was here — 

 I believe — always the fold. The thrust was the con- 

 sequence of exaggerating of the folds. 



So it is not of principal value whether one speaks of 

 overthrusts or overfolds with squeezed -out middle 



* 223 square miles is the measurement given by the Swiss Typo- 

 graphical Bureau. Professor Forel states it at 225J square miles 

 (Encyclopaedia Britannica). 



