26 Flowers and their Unbidden Guests. 



from below, -would act injuriously. Nay, even insects 

 whose sole method of access to a flower is hy flight, 

 may act sometimes advantageously and sometimes 

 prejudicially, and, therefore, be sometimes welcome 

 and sometimes unwelcome guests, according to the 

 further course which they adopt within the flower 

 itself. Of this, however, abundant evidence will be 

 adduced later on. 



