I.] 



BY WIND AND INSECTS. 



Again, as Mr. Darwin has pointed out, irregular 

 flowers appear to be almost always fertilised by 

 insects. 



Wind-fertilised flowers, moreover, generally have 

 the stigma more or less branched or hairy, which 

 evidently tends to increase its chance of catching the 

 pollen. 



Figs, i to 6, taken from Axell's work, illustrate 



FIG. i. 



FIG. 2. 



FTG. 3. 



FIG. 4. 



FIG. 5. 



FIG. 6. 



FIG. i. Stigma of the Alder. FIG. 2. Of the Hop. FIG 3. Of the Wheat ; which 

 are anemophdlous. FIG. 4. Of the Willow. FIG. 5. Of the Flax. FIG. 6. Of 

 Nuphar ; which are entomophilous. 



this difference. In the alder (Fig. i), the hop (Fig. 2), 

 and wheat (Fig. 3), the pollen is wind-borne, whence 

 they have been termed by Delpino " anemophilous ; " 

 while in the willow (Fig. 4), the flax (Fig. 5), and 

 nuphar, (the yellow water lily) (Fig. 6), it is carried 

 by insects, whence such plants have been termed 

 " entomophilous" 



