On the Colour and Smell of Plants. 13 



c. Genera which contain 70 100 per cent, white in their flowers. 



Among 159 species there are 82 which are odoriferous, and hence taking 

 the mean 38.99 per cent. 



2. Violet flowering genera. 

 a. Violet flowering genera which contain 12 percent, white in their flowers. 



Of 24 species there is not one that is odoriferous. 



Violet flowering genera containing 12 70 per cent, white in their flowers- 



Of 230 species there are 8 odoriferous, and hence taking the mean 3.47 

 per cent. 



c. Violet flowering genera, containing 70 100 percent, white in their flowers. 



Of 41 species there are 10 odoriferous, and hence taking the mean 

 per cent* 



