150 PEOFESSOR EDWAED HULL, M.A., LL.D., F.R.S., F.G.S., ON 



endeavoured to prove the great changes of level of the Glacial 

 period, the views of Professor Brogger are most satisfactory, as 

 he shows that " the sea-bottom, during the time of the greatest 

 ice sheet of Europe, must have been uplifted at least 2,600 metres 

 (8,528 feet), higher than it is at present (p. 683), which even 

 exceeds the amount of elevation deduced by the writer from the 

 depth of the sub-oceanic river valleys, at the commencement of 

 the Glacial period. On the other hand the extent of the sub- 

 mergence undergone by the land in the Ki'istiania region is 

 determined to have been 215-216 metres (about 710 feet), at 

 the period when the highest of the terraces was in course 

 of formation ; and at Mjosen it w^as even somewhat more, or about 

 768 feet. E. H. 



COMMUNICATIOiS^ FROM CaVALIERE W. P. JeRVIS, F.G.S. 



Thus it is only this week that I have read with the liveliest 

 interest your welcome studies. Since I have closely followed your 

 several papers on the enormous changes of leA^el throughout a 

 considerable part of the Atlantic, 1 was prepared to learn much 

 more with the like interest, and feel very pleased that you con- 

 tinue to examine a question which, though in consonance with all 

 the teachings of science, has been so little understood by geologists — 

 in fact, 1 believe, as I already expressed it, that it is high time for 

 us to investigate the former conditions of that part of our globe 

 which is now covered by the ocean. 



It is to the future teachings of this important study, and to 

 which 1 suggested the name of Thallassology, in view of the vastness 

 of the subject, that I believe that geology will be incalculably 

 indebted, in order to gain a clearer insight into the history of the 

 globe. 



Several points in your paper struck me as most important 

 explanations of difficulties which I was unable before to under- 

 stand. 



I had not an idea that the raised beaches in Norway were of a 

 nature analogous to those of the British Isles, and indicating so 

 clearly, by sub-Arctic fauna along with glacial detritus, an emersion 

 subsequent to the Ice Age, but before the rigidity of the climate 



