84 
"ON GROWING IPOMjEA RUBRO-CERULEA, AND 
prudence ; but we cannot consent to " unknow all our knowledge," for a mere assertion, 
and to vote a system vicious which has effected wonders in every branch of high 
cultivation. 
Whatever may result ultimately from fresh adaptations of, and ingenious 
additions to machinery, certain it is that the Arnott or Polmaise stove, or other 
modification of a central fire with a wet blanket, will never furnish bottom-heat, or 
be applicable to the greenhouse. They refer to the vinery ; but as that structure 
does not enter into the plan of our work, we refrain from saying any more on a 
subject which is irrelevant to our design ; nevertheless, the above remarks were 
needed, to caution readers who might misapply facts adduced in other periodicals. 
ON GROWING IPOMiEA RUBRO-CjERULEA, AND 
PHARBITIS LEARII, IN THE OPEN AIR. 
Notwithstanding, in treating of the above plants, we run the risk of going over 
ground previously traversed, we have not the slightest hesitation in directing atten- 
tion to any plan, the adoption of which will enable such truly resplendent subjects to 
be more universally grown, and their beauties to gratify more extensively those who 
can appreciate their worth. 
In floricultural, as in all pursuits which minister to the gratification or neces- 
sities of man, what constitutes the objects of those pursuits engages his attention, 
or occupies his time and talents, only so far as they are esteemed really valuable. 
Next to a plant being known to be highly ornamental, the criterion of its value is the 
extent to which it can be rendered popularly so. A very slight practical acquaintance 
with plants, and the circumstances which contribute to their being cultivated, will 
suffice to convince that one of any kind, whatever its merits, engrosses regard in 
proportion to the extent those merits are widely understood and appreciated, or the 
reverse, under an opposite state of things. Our position in a peculiar manner brings us 
in contact with circumstances which enable us to understand this fact in its fullest 
extent. 
The two plants under consideration are associated together in the present notice, 
more because the treatment we are desirous to see applied to them is equally advan- 
tageous to both, than from their general similarity to each other, either as to the 
management they experience, or their botanical resemblance. Ipomcea rubro-carulea, 
as being more directly pleasing in general aspect, more truly gorgeous when flowering 
well, we will first advert to, by taking a review of the manner in which it is usually 
grown. As an annual, it is raised in early spring, and every encouragement to free 
growth afforded it ; how exultingly to appearance it appreciates its advantages by 
inconceivably rapid and vigorous growth, those having any acquaintance with its 
