304 JOSEPH PEESTWICH^ P.E.S.; P.G.S.^ ON A POSSIBLE 



allows him. As it is, it extends inland to Asia Minor, and coast- 

 wise to the shores of Syria ; but he has little doubt of its extension 

 further inland in the direction of Armenia and Babylonia. The 

 inland forms of the Rubble-di-ift are however so obscure, and have 

 been so little investigated in that area, that we must wait for 

 farther evidence. He only regrets that for the same reason he is 

 unable to speak of the Red Sea and Siberian areas. 



In reply to Mr. Warren Upham, who considers that the uplift of 

 the land could not have produced currents of sufficient force, he 

 would refer him to a paper by the late distinguished mathe- 

 matician Mr. Hopkins of Cambridge, in which he shows that 

 currents of extreme velocity and force may be produced by such 

 uplifts. {Quart. Jonrn. GeuL Soc, vol. vi, p. 90, and given in 

 abstract in Quart. Journ-. Geol. Soc, vol. xlviii, p. 332.) The 

 suggestion made by his (Professor Prestwich's) old friend, the 

 late Mr. Godwin- Austen, that in the " Head " area, the land 

 might have been raised to a height of 2,000 feet, was simply a 

 snggestion made to obtain a supposed necessary degree of cold, but 

 it was net supported by any facts. Professor Prestwich would 

 ask Mr. Upham if a 2,000 feet uplift were required for the 

 English coast, what would be the elevation needed to produce 

 the same results on the coasts of North Africa, and what 

 evidence is there of it? He has not overlouked the opinions 

 referred to by Mr. Upham, of Mr. Godwin-Austen, and other 

 geologists (see Quart. Journ. Geol. Soc, vol. xlviii, pp. 305-323), 

 and has stated his objections to them (pp. 326-328). They 

 would be too long to repeat here. 



He feels that there are yet many points of difficulty to clear up, 

 but it would be better that the argument should be on new lines, 

 rather than on objections already discussed and answered. 



