14 Introductory 



nothing to be done — nothing to take their place. 

 Man has not yet discovered any substitute for the 

 bee. 



In the following chapters we shall consider in more 

 detail the various ways and means by which the work 

 of the great farm is carried on by the natural labourers; 

 and also some of the changes made in it by the work 

 and unconscious influence of man. 



