178 



POPULAR GARDEN BOTANY. 



forcing-house earlier than here mentioned, making them 

 still more acceptable and rare. Another writer of authority 

 in c The Rose Garden/ a useful work for the lover of these 

 beautiful plants, advises that when Roses are to be culti- 

 vated under glass, whether intended to be forced or not, 

 they should be thinned and shortened in autumn ; and that, 

 if Roses are required to bloom as early as February and 

 March, artificial heat must be employed from the middle of 

 December, commencing with a gentle heat, increasing gra- 

 dually, and allowing of a variation of eight or ten degrees 

 between the night and day temperature ; if a forcing-pit is 

 at hand this will be the best place, but care must be taken 

 that the Aphis, or green-fly, does not attack them ; should 

 this pest appear, the pit must be filled with tobacco-smoke 

 till they are all killed. The Tea-scented and Chinese Roses, 

 also some of the Noisettes and Bourbon, are tender, and 

 will be the best for growing in the greenhouse. 



SAXIFRAGACMM 



Exogens, with flowers having the stems simple, often naked. 

 Calyx superior or inferior, of four or five divisions, which cohere 

 more or less at the base. Petals five, inserted between the lobes 



