304 ON THREE NEW INDIAN GENERA. 
19. According to the nature of the plants in the house and its sub- 
divisions, the amount of moisture given to them by various contrivances 
must be regulated. The antiquated terms hot and moist, hot and dry, 
cold und moist, cold and dry, find an application here to some extent ; 
for example, plants from dry places require being heated exclusively by 
means of hot air conveyed in pipes; while others are best suited by 
tubes conveying hot water, or by a regulated admission of warm va- 
pours. On these important differences depend the terms of dry and 
damp stoves (to which latter belong those for Orchidee) ; but as we 
become nearer acquainted with the wants of certain families and floras, 
according to the degree and periodicity of a variety of influences, we 
shall have to proceed further in these subdivisions; and this points 
out, that the cultivation of Orchidee, Ferns, Bromeliacee, Aroidea, 
Scitaminee, ete. ought, as far as practicable, to be kept asunder. 
20. The ventilation of the building is another point of great weights 
for free air furnishes not only the pabulum vite to plants, causing 
the manifold internal movements of vegetation; but it promotes the 
act of impregnation, among others by the aid of small insects. The 
cultivator has moreover the power of adding certain gases to the at- 
mosphere in the house, which may serve, under certain circumstances, 
to promote vegetation. 
21. Aquatic plants being, with few exceptions, of humble stature, 
their cultivation belongs properly to low stoves. Some kinds of a taller 
growth might be suitably provided for in conservatory stoves by placing 
them round fountains or artificial cascades. They will however attain 
their greatest perfection in stoves especially devoted to their culture, 
and heated by hot water. 
On three new Genera connected with the INDIAN FLORA; by 
GEORGE BENTHAM, Esq. 
I. Stocksia. (Nat. Ord. Sapindacee.) 
The fine collection of plants made by Dr. J. E. Stocks in Upper Be- 
loochistan in April and May, 1850, has already supplied materials for 
some interesting papers by that zealous botanist in the former volumes 
of this Journal, and he is now preparing a general catalogue of all his 
