On the question as to former Glaciers in North Wales. 469 



opinions which to my mind are but the necessary conse- 

 quences and developments of the great path which Lavoisier 

 marked out for modern chemistry ; allow me, I say, to ex- 

 press myself as he did with regard to his fellow-labourers and 

 his friends. 



If in my lessons, if in this summing up, I have chanced to 

 adopt without mentioning them the experiments or the opi- 

 nions of M. Boussingault, it is that the habit of communica- 

 ting to each other our ideas, our observations, our manner of 

 viewing things, has established between us a community of 

 opinions, in which we ourselves even afterwards find it difficult 

 to distinguish what belongs to each of us. 



In resting these opinions and their consequences on his 

 name and on his authority, in telling you that we work ac- 

 tively, sometimes together, and sometimes apart, in order to 

 verify and to develop all these facts, all these results by ex- 

 periment, I do but evince my anxious desire to justify the in- 

 terest which you have this year taken in my labours. 



For this I beg to thank you. It has given me courage to 

 undertake a long course of researches; if anything useful to 

 the progress of humanity should result from them, let all the 

 honour of it redound to the intelligent good will with which 

 you have constantly surrounded me, and for which I shall ever 

 be profoundly grateful. 



LXX. On the question, Whether there are any evidences of 

 the former existence of Glaciers in North Wales P By J. E. 

 Bowman, F.L.S. & F.G.S. * 



THE recent discovery of traces of ancient glaciers in Scot- 

 land and the north of England, rendered it probable that 

 similar appearances would be found in North Wales, where, 

 though situated in a somewhat lower latitude, the slight in- 

 crease of temperature is fully counteracted by the greater al- 

 titude of the central mountain group. The geographical situa- 

 tion of all these parts of our island with respect to the sea, and 

 the geological periods of their elevation may be considered to 

 be so nearly the same, that if glaciers can be satisfactorily 

 proved to have once existed in one, there seems no reason to 

 doubt their occurrence in the rest, even admitting them to 

 have had a much more local origin and limited range than 

 Prof. Agassiz has supposed. If we compare the mountains 

 of Britain with those of Switzerland, where the most un- 



* Communicated by the Author, 



