SEXUALITY OF PLANTS 39 



agents, the flowers are attractive and conspicuous by 

 their scent, by honey- secretion, and by widely expanded 

 floral envelopes of bright colour. The latter attract the 

 eye, the former the other senses of the animal, and lead 

 him to visit the flower for his own purposes of gathering 



FIG. 19. 



A spikelet of a Grass, showing one flower in bloom, with three anthers on their 

 flexible filaments, and two feathery stigmas. These, with the inconspicuous size 

 and colour, are common characters of plants pollinated by agency of wind. 



honey, or pollen. Incidentally the floral mechanism is so 

 arranged, in size and form of its parts, that as he visits 

 the flower, pollen, often of a sticky nature, is deposited 

 on his body. The flower may be so formed as to lead 

 him to take a definite position, so that the pollen is 

 deposited on a definite part of his body. The result of 

 a succession of visits to a succession of flowers of like 

 construction will then be that, if the stigmas correspond 



