310 LOUIS AGASSIZ. 



explicable on your theory, and he has con- 

 sented to my proposal that he should imme- 

 diately lay them all down on a map of the 

 county and describe them in a paper to be 

 read the day after yours at the Geological So- 

 ciety. I propose to give in my adhesion by 

 reading, the same day with yours, as a sequel 

 to your paper, a list of localities where I have 

 observed similar glacial detritus in Scotland, 

 since I left you, and in various parts of Eng- 

 land. 



There are great reefs of gravel in the Hme- 

 stone valleys of the central bog district of 

 Ireland. They have a distinct name, which I 

 forget. No doubt they are moraines ; if you 

 have not, ere you get this, seen one of them, 

 pray do so.^ But it will not be worth while 

 to go out of your way to see more than one ; 

 all the rest must follow as a corollary. I 

 trust you will not fail to be at Edinboro' on 

 the 20th, and at Sir W. Trevelyan's on the 

 24th. . . . 



A letter of later date in the same month 



^ Agassiz was then staying at Florence Court, the seat 

 of the Earl of Euniskillen, in County Fermanagh, Ireland. 

 While there he had an opportunity of studying most interest- 

 ing glacial phenomena. 



