Campanula Barbata. 93 



mouth of the bell like a net or lattice- work, were 

 intended to guard the nectar from such flying insects 

 as were too small to come in contact with the 

 centrally-placed stigma and poUen-smeared style, 

 when making their approach from the edge of the 

 perianth. But this is certainly not the case ; for 

 independently of the fact that the nectar in this 

 flower is protected by another method, which will be 

 described in the next section, it is easy to convince 

 oneself, by actual observation of the behaviour of 

 insects in visiting the flowers, that the long trichomes 

 which trelUse the mouth of the corolla are no protec- 

 tion whatsoever against such insects as may alight 

 on the edges of the petals. On the contrary, such 

 insects will be seen to climb over the trellis until they 

 reach the free ends of its component hairs, which come 

 close to the centre of the mouth of the bell, where the 

 style ends in three spreading or recurved stigmas. 

 (Plate III. fig. 88, longitudinal section of flower.) The 

 insects pass over to these stigmas from the treUis hairs 

 in order to make a further advance into the recesses 

 of the beU. ; the trellis in fact serves them simply as a 

 bridge ; and conducts them eventually, though after a 

 circuit, to the self-same entrance as that to which 

 humble-bees direct their flight at the very first. 

 Whichever method of approach then is adopted by 

 the insect, the result is the same ; and I have myself 

 seen small beetles {Anthobium sorH Gyll., Meligethes 



