THE GLACIAL RANGE CONTRACTION, ETC. 65 



snow-fields, and were the first to move north with an 

 amelioration of climate. In the accompanying table I 

 have arranged those species which probably composed 

 the avifauna of this area during the third, and most 

 probably the second cold periods of the Glacial Epoch, 

 giving their normal southern winter limit in Western 

 Europe at the present time, together with the food 

 on which they habitually subsist, and which is of 

 precisely that character which would be obtainable 

 under the glacial conditions of the climate of that 

 remote period. 



