FLORAL DLPLOMACY. 



79 



of the stamens and pistils, so that crossing may 

 ensue. In the Primroses this is seen to perfection, 

 for the flowers of one plant 

 have the stamens situated 

 just at the point where, ^ 

 in those of another plant, 

 the stigmatic surface of 

 the pistil appears. This 

 contrivance has been 

 established, so that an in- 

 sect may be dusted with 



the pollen from the Prim- Fig. 27. -Fertilisation of Primrose (Z^^;-- 



ivin), showing how the long stamens 

 rose flower, precisely on fertilise the long plstlls, and the short 



1-1 stamens the short pistils. 



that part of its body which 



will come into contact with the pistil in another 



flower. Common people have long distinguished 



St J 



St 2 



Fig. 28. — Structure of Wallflower. The different-sized stamens {st. i and 2 

 may be regarded as an organic change tending to dimorphism. 



such Primroses under the names of " pin-eyed " and 

 " Rose-eyed ; " but the term Dimorphism is now 

 applied to the phenomenon, which is in vogue among 



