ae 
J. Crol—Aretie Interglacial Periods. 301 
found to be true in reference to the temperate regions, the 
polar interglacial periods were more marked than the glacial, 
it does not follow that on this account the relics of the inter- 
glacial periods which remain ought to be more abundant in 
polar than in temperate regions. On the contrary, the reverse 
ought to be the case. In the polar regions, undoubtedly, there 
is least likelihood of finding traces of interglacial periods; for 
there, of all other places, the destruction of such traces would 
be most complete. The more severe the glaciation following a 
warm period, the more complete would be the removal of the 
remains belonging to the period. If in such places as Scot- 
land and Scandinavia so little is left of the wreck of inter- 
evidence against the probable existence ; 
Who would expect to find such remains in ice-covered regions 
like Greenland and Spitzbergen ? though not a trace is 
Arctic regions during Pleistocene times holds true, however, 
only in regard. to those parts, like Greenland, which have 
iation 
undergone severe glaciation. When we examine Siberia and 
other places which appear to have escaped the destructive 
power o ice, we find, from a class of facts, the physica 
abundant proofs of a mild and equable condition of climate. 
ains were carried down by rivers. It was consider 
climate go x gl as that of Siberia. The opinion that the 
remains were floated down the Siberian rivers is now, however, 
abandoned. by Russian naturalists and other observers who 
have carefully examined the country. , 7 
OUR. i Series, Vou. X XIX, No. 172.— APRIL, 1885. 
