236 THE PRINCIPLES OF FLORICULTURE 



281. Temperature and moisture conditions in carnation 

 houses. The house temperatures should be carefully 

 regulated, for on this depends in a large measure the 

 vigor of the plants. A night temperature of 52 to 55 

 should be maintained, and during -the day the mercury 

 should rarely go above 70. The atmosphere should be 

 fresh, and sufficiently moist to prevent attacks of red- 

 spiders. Syringing the foliage, and dampening the walks 

 on sunny days, should be practiced. 



282. Feeding. After the plants have been growing for 

 about two months, they will have practically exhausted 

 the soil. Additional food should then be given, as fast 

 as the plants can use it. The food may be in the form of 

 liquid manure or light mulches. 



283. Disbudding carnations. The plants should be 

 looked over frequently and all' side buds removed. This 

 favors the development of a perfect flower. Flowers 

 should be cut as soon as they are fully developed. This 

 is indicated in a measure by the maturity of the stigma. 

 If left uncut, the plant's vitality is weakened. 



ROSES 



284. Botanical classification. Order, Rosaceae ; genus, 

 Rosa (an old Latin name) ; species of indoor roses are 

 largely the blended product of R. gallica and R. chinensis. 



285. Present-day varieties forced under glass, and their origin. 



1. Pink: 



Killarney, Dickson & Son, 1898 



Double Pink Killarney, R. Scott & Sons, 1911 



My Maryland, Cook, 1909 



Antoine Rivoire (or Mrs. Pernet-Ducher, 1896 



Taft), 



J. L. Mock, Leenders, 1901 



Mrs. Charles Russell, Montgomery, 1913 



Killarney Brilliant, Dickson & Son, 1914 



