M. Charpeutiei" on llie Enadc Phenomena of the North. 59 



group, to the Caucasus, to the Himalaya, &c., their present 

 configuration.* It must have been the effect, the inevitable 

 consequence, of that revolution {Essai, § 82). The facts de- 

 mand this conclusion in so decisive a manner, that it is even 

 admitted by geologists who do not adopt the glacier hypo- 

 thesis. Thus M. Durochert supposes, " that the winters in 

 Europe were colder during the geological period which imme- 

 diately preceded the present one ;" that is to &ay, the epoch 

 during which the dispersion of the erratic debris took place. 

 This opinion is supported in a note at the bottom of the page 

 by jNI. Elie de Beaumont. Instead, however, of supposing 

 with M. Durocher, the existence of colder wintei's than those 

 of the pi'esent day, I should rather be inclined to believe that 

 they were more snowy than they now are, but that the sum- 

 mers were more rainy and colder, so that the difference 

 between the mean temperature of summer and that of winter 

 was less considerable than it is at present. Such a climate 

 must have been very analogous to that of Terra del Fuego, 

 and the northern coast of the Straits of Magellan ; for, judg- 

 ing from the work of Mr Darv\in,^: the climate of the most 

 southern portions of America is perfectly similar to that which 

 must formerly have prevailed in the north, if the summers in 

 the former were a little more cold and more rainy, and the 

 winters more snowy. If this were the case, these regions 

 would now present us with the same phenomenon which was 

 formerly exhibited in the north, that of a vast country entirely 

 covered by an immense glacier. 



There is another difficulty which prevents many persons 

 from adopting the hypothesis of glaciers for the explanation 

 of the erratic phenomenon of the north, a difiiculty arising 

 solely from the erroneous idea conceived of the origin of 

 the snow or the ice that must have formed that immense 

 glacier. They, in fact, imagine, that the snow which has 

 formed the ice of a glacier, proceeds entirely from the moun- 

 tain on which it takes its origin ; and they found this opinion 



* Elie de Beaumont in tlie French translation of De la BecLe, p. C59. 



t Report on a Memoir by M. Duroclier, entitled, Observations svr le Phhio- 

 inC.u: Diluvial daas le Nurd dc fExirope, ]}, 2b. {CumiiU's llaulus, vol. xiv. p. 

 101, Edit.) 



t Journal of Kcbcarclieb in CJeology, &c. 



