FIG. 19. Wild Chervil (Jutrophylliiin sylvtstre) 



CHAPTER II. 



AT first sight, it may seem an objection to the 

 view set forward in the preceding chapter, that some 

 flowers as, for instance, those of the common Antir- 

 rhinum which, according to the above-given tests, 

 ought to be fertilised by insects, are entirely closed. 

 A little consideration, however, will suggest the reply. 

 The Antirrhinum is especially adapted for fertilisation 

 by humble bees. The stamens and pistil are so ar- 

 ranged that smaller species would not effect the object. 

 It is therefore an advantage that they should be ex- 

 cluded, and in fact they are not strong enough to move 

 the spring. The Antirrhinum is, so to say, a closed 

 box, of which the humble bees alone possess the key. 



The common Heath (Erica tetralix] offers us a very 

 ingenious arrangement. The flower is in the form of 



