Notices of Mevnoirs. 33 



along the strike either as the stoss or the lee side of a roche moutonnee, 

 and become moulded accordingly. This, so far as I know, is not 

 the case. 



The greater perfection of the Dale terraces at high altitudes is 

 strictly paralleled, I think, by the bolder character of the escarp- 

 ments on the watershed of Northumberland betwixt the Tynes, and 

 is susceptible of the same explanation. The influences of rain and 

 frost, shed broadcast over the face of the country, are at higher levels 

 less interfered with by the concentrated and rapid agents of denuda- 

 tion, and are thus permitted to prick out a configuration purely 

 determined by the relative resistance of the materials acted upon. 

 In the Yorkshire Dales, too, the lower-lying scars have probably 

 been smoothed back by the ice with which they brimmed during the 

 Glacial Period. The valleys necessarily added their own depth to 

 the thickness of the ice-sheet, and taking the case of one 500 feet 

 deep, the erosive force acting on the bottom would be 243,000 lbs. per 

 square yard -^ greater than the pressure on the summit of the valley 

 wall. In the beautiful basin containing Loch Seraerwater (near 

 Bainbridge, Wensleydale), I had remarked the obscurity of the 

 terraces on the lower slopes. The glacier force concentrated in the 

 excavation of the loch must have extended some distance up the 

 sides planing the outcrops back, but high on the west side they 

 stand out with great individuality and in form almost rectilinear. 



Having thus, as I think, met Mr. Goodchild's arguments, I will in 

 concluding epitomize the opinion for which, as for much else, I was 

 first indebted to the vigorous teachings of the honoured author of the 

 " Physical Geology and Geography of Great Britain." The question 

 is not, How quick will an escarpment recede when once foi^med? 

 but, Given a series of regularly outcropping sandstones, limestones, 

 and shales in marked beds, what form will their outcrop in time 

 assume ? And I think there can be no doubt of the form they must 

 assume. 



nsroTiciES OIF :M::E]^v^OII^s. 



"Uebee, die Fauna dee, Gaskohle dbs Pilsner und Rakonit- 

 ZEE Beckens." Dr. Anton Feic. Sitzung der Mathematisch- 

 naturwissenschaftlichen Classe der k. bohm. Gesellschaft der 

 Wissenschaften am 19 Marz, 1875. 



IN April, 1870, Dr. Fritsch gave a notice to the Royal Bohemian 

 Academy of the occurrence of animal remains in the Gas-coal 

 of Nyran near Pilsen, from which deposits he enumerated ten 

 species of Saurian remains. Fishes, and Arthropoda. Since then the 

 author has collected new materials, and has studied the specimens 

 more in detail. Still more recently he has obtained a rich series of 

 remains from the Gas-coal of Kounova, near Rakonitz, which exhibits 

 a fauna identical with that of Nyran. Of these localities he now 

 briefly enumerates the series of remains. He considers his researches, 



1 Tyndall, Phil. Mag. 1864, part ii. p. 285. 



DECADE II. — VOL. III. — MO. I. 3 



