322 PROP. HULL, LL.D., P.R.S., ON THE SUBMERGED TERRACES 



and a rise or fall of 10,000 feet would amount to only ^ ^\ ^ th part 

 of the earth's diameter. 



The Chairman. — I will now ask Professor Hull to reply to the 

 remarks made upon his paper. 



The Author. — T need not say that I am exceedingly gratified at 

 the manner in which this communication has been received, and 

 particularly by the comments thereon of Prof. Etheridge ; from his 

 position as one of the most eminent geologists in the British Isles, 

 or, perhaps, the world, and as former President of the Geological 

 Society, observation s^from him must have considerable weight, and 

 what he has stated satisfies me that I have not pursued a mare's 

 nest — in fact, I am indebted to him for having extended my 

 observations to the Bay of Biscay. I had, incidentally, a con- 

 versation with him some time ago upon the subject, and he then 

 expressed his desire that I should carry on my observations to 

 the Bay of Biscay, and they proved so exceedingly interesting that 

 I feel grateful to him for the suggestion he then made. I wish 

 also to add my sense of the value of Professor Rupert Jones' 

 letter, showing how clearly he has comprehended the sub-oceanic 

 conditions considered in my paper. 



Mr. Howard has introduced a very interesting point about the 

 silting up of rivers, which of course is quite confirmed. I am also 

 gratified by Professor Logan Lobley's statement and concurrence 

 in my conclusions. As he has said, the statement in my paper 

 as to the locking up, of the ocean waters by permanent ice in the 

 Glacial Period, as accounting for the lowering of the surface of 

 the ocean, requires to be taken with a very large grain of salt. It 

 is not my own. 



Dr. Walker has given us some additional views about Iceland, 

 and I agree with him that the further north we go from the 

 European area the more likely is it that the fauna and flora would 

 decrease in number and variety. 



I must say that Dr. Walker's observations on Iceland,* published 

 some years ago in the Transactions of this Institute, form one of 

 the most valuable papei-s I have ever read ; and it will well repay 

 the perusal of any member of the Institute interested in the 

 subject. 



I am obliged to the Chairman for his suggestions as to the 



* "The Botany and Entomology of Iceland," Journal of Transactions^ 

 vol. xxiv. 



