THE GREEN-HOUSE. 



91 



liage, and we have been most particular in selecting 

 an equal number of species of these colours as of the 

 yellows. It is a remarkable fact, that there are very 

 few green-house plants that have blue flowers ; and 

 for this reason we have been particularly attentive to 

 get the proper assortment of them. Cineraria, Di- 

 dsma, Daphne. Indigdfera, Statice, Convolvulus^ 

 Lavandula, Podaly^ria, TracJielium, but especially 

 Polifgala, are valuable genera as producing blue or 

 purple flowers ; though some of the species, as of 

 Statice and Trachelium, are not quite so handsome 

 in foliage as could be wished. Purple is the next 

 colour in scarcity to blue ; but of this there is a fine 

 resource in the genera Pelargonium and Einca. 



Fourthly, To ensure a fragrant odour in the green- 

 house every day of the year. This will be found 

 accomplished by the Acacia family in January, Fe- 

 bruary, and March ; by Myrtles and Geraniums in 

 April and May ; by the Citrus tribe in June ; and by 

 an abundant variety during the rest of the season till 

 September, when the fragrance of the green-house 

 atmosphere must be kept up by tree mignionette, a 

 plant of which there ought to be two or three speci- 

 mens in the house throughout the year. {See Sect. 

 4. infra?) 



Fifthly, We have chosen plants of easy culture, 

 and which flower well when of a small or moderate 

 size. 



