1000 



THE PRACTICAL GARDENER. 



sary to protect this plant if in a properly-constructed house, 

 and we would say never, excepting to repel the most severe 

 frost in winter, as it is almost sufficiently hardy to stand un- 

 injured our general winters, when planted in any sheltered 

 situation. However, in their culture in houses entirely ap- 

 propriated for them, a deviation from this rule is necessary, 

 when the object is to cultivate them in the first degree of ex- 

 cellence. When they are about to form their flower-buds, a 

 gentle and moist heat is required, and which may be with 

 advantage continued until their buds be completely formed, 

 and nearly ready to expand ; at which period, they should be 

 either removed to a colder house, or, if the whole be equally 

 advanced, the temperature of the house in which they are 

 should be reduced to that of its natural state. 



GREEN-HOUSE AQUARIUM. 



The aquarium Is a house furnished with suitable conve- 

 niences for the cultivation of aquatic plants ; but the greater 

 portion of them are either hardy, and consequently cultivated 

 in the open air, or, being natives of tropical climates, are 

 tender, and cultivated in the hot-house aquarium. Some few, 

 however, very interesting species are from temperate climates, 

 and are well calculated for the general temperature of the 

 green-house. A small house for their reception is sometimes 

 to be met with, the arrangements of which need not be dif- 

 ferent from those of the hot-house aquarium, (for which, see 

 Supplement,) and the general culture being the same, the dif- 

 ference of temperature being understood, any further notice of 

 it here might be deemed superfluous. 



