THE VIOLET FAMILY. 219 



III. Variation as seen in the cultivated pansy. Obser- 



vations of differences of size, shades, and distri- 

 bution of color and other peculiarities, even if 

 restricted to the pansies grown in a single town, 

 give a vivid impression of the extraordinary capac- 

 ity for variation and the equally remarkable per- 

 sistence of essential features exhibited by this 

 species. 



IV. Dissemination of seeds by different species of violets. 



See Lubbock, Flowers, Fruits, and Leaves, p. 54 

 et seq. 

 V. Cleistogamic flowers. See Darwin, Different Forms 

 of Flowers on Plants of the Same Species, Chap. 

 VIII. 



