On the Colour and Smell of Plants. 



3. Slue Flowering Genera. 

 a. Blue flowering genera containing 012 per cent, white in their flowers. 



Of 489 species there are 8 odoriferous, and hence taking the mean 1.63 per 



cent. 

 b Blue flowering genera, containing 1270 per cent, in their white flowers. 



Of 220 species there are 23 odoriferous, and hence taking the mean 10.45 



per cent. 



c Blue flowering genera, containing 70 100 per cent, white in their flowers. 

 Heliotropium contains 4 odoriferous species in 31 ; and 13 per cent, blue, 



3 red, 3 yellow, 73 white. Hence, taking the mean, there are 12.90 



per cent., odoriferous species. 



4. Green Flowering Genera. 

 a Green flowering genera, containing 12 per cent, white in their flowers, 



and having a pure green tint do not occur ; but perhaps the genus Helle- 



borus might be referred to this division. 

 6 Genera containing 1270 per cent, white flowers. 



Of 40 species there are 4 odoriferous, and hence 10 per cent. 



