THE WEATHER FOR SEPTEMBER. 
257 
cold part of the greenhouse, where air can be given on fine days; and they 
should be near the glass, and yet quite protected from frost. During this 
period they ought to get as little water as possible, no more than just sufficient 
to keep them alive during the winter. When the Spring comes, and the 
shoots are tough enough for the purpose, they should be taken off and planted 
as early as possible, because they will grow much more vigorously, and 
flower much finer, than those plants which have been kept throughout the 
winter. 
Thunbergias— should be treated much in the same manner as Verbenas, 
only they should be potted during the winter in small sixties, and not in large 
ones. 
Penstemons. —With few exceptions these will succeed very well in situations 
resembling their native habitats, which are the high and dry grounds of Central 
America; but very few of them will succeed in situations which are low and 
damp, and therefore they ought not to be buried in such situations. The 
surest plan is to strike young plants every summer, pot them in large sixties, 
and place them in a frame, a pit, or a greenhouse for the winter; while there, 
they will require very little water, but they must be equally protected from 
wet and frost. 
If any thing desired is omitted in these brief notices, our friend will have 
the kindness to write again. 
THE WEATHER FOR SEPTEMBER. 
In the latter part of August, the temperature became very much lower 
than it had generally been in the earlier part of the former month, and this 
low temperature continued for some time in September. In few places, if in 
any, was it so low as the freezing point; and the days and nights were almost 
equally cold, with very little sunshine. This cold, at a time when the heat is 
usually about the greatest, was what we might call unseasonable; and yet it was 
not so unfavourable to vegetation generally, as if the days had been warm and 
sunny, and the nights cold. When this is the state of the weather at an 
advanced period of the season, plants in growth are alternately warmed and 
chilled at very short intervals, which is always productive of weakness, and 
sometimes of destruction to plants, of whatever countries they may be natives. 
The cold which we have mentioned was not of this character, because there 
was but little evaporation or formation of dew, and no hoar frost; both of 
which are injurious, by producing chill in the plants while the morning sun is 
turning the dew or hoar frost into vapour. Under a bright sky, this is 
speedily done, and the chilled plants become as quickly heated by the sun; 
unless in such as belong to the sun-proof genera, whose native habitat is 
on arid plains, and where a portion of the natural sap of the leaves is also 
evaporated through the epidermis. This renders the leaves and other tender 
parts more susceptible to heat during the day, and consequently, the cold of 
VOL. II. NO. XI. 
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