THE EVOLUTION OF LIVING BEINGS. 51 



ons consisting of nothing but hybrids and this may 

 lead, as in the case of the Linneon Buteo Buteo, to a 

 most bewildering number of types within the Linne- 

 on, as splendid material present in the Natural His- 

 tory Museum of Leiden, shows. 



It results from what has been said, that nature prima- 

 rily makes but individuals, but secondarily groups of in- 

 dividuals, and that we will have to investigate whether 

 such groupings, made by nature, are covered by our Lin- 

 neons or not. 



