I. aKImalcula of infusions. 73 



been found with the rein -deer ; its naturalization 

 has often been attempted in France and Germany, 

 but inftead of multiplying they always perifhed( i ). 



The kw reftraining quadrupeds to their native 

 countries is liable to modifications j for there 

 are fome that can exift and multiply in temperate 

 though originally from warm climates. The 

 rabbit and guinea-pig are inflances of the former ; 

 the beaver and lynx of the latter(2). 



Birds may in this inveftigation be confidered 

 as divided into two clafles : Of thofe inhabiting 

 cold, temperate or warm countries, fome do not 

 wander far from their native place, or do not 

 change their climate. Others have no fixed 

 abode, but change according to the different fea- 

 fons, being neceifitated to it either by the fcanti- 



nefs 



(i) Buffon Hiftoire Naturelle, torn. 14. 



(2) It is very true, that the animals which have been 

 removed all at once from cold to warm climates, and the 

 reverfe, have ceafed to propagate their fpecles. However, 

 there are feveral exceptions, and more will be known in 

 proportion as natural hi (lory continues to be further cul- 

 tivated. Perhaps the ceflation of multiplying their fpecies 

 arifes from the great and fudden change : but if one ge- 

 neration was removed two degrees farther north or fouth, 

 propagation would moft probably continue. If their pro- 

 geny were removed two degrees more, and fo proceeding 

 by fliort diftances, every generation, there is great reafon 

 to fuppofe, would continue fertile, and the animal be natu- 

 ralized in anv climate— -T. 



