Turnip seed, too, mangel-wurzel and swedes, onion, pea, bean,
carrot, parsnip, radish, and beet seeds could be grown here by the
same skill, care, and training as they are grown abroad.
An interesting method of forcing plants by the use of hot water
baths is described in _La Nature_ (Paris), by Henri Coupin. The
process is much simpler than others now in use and may be employed
by any one who has a small greenhouse, no expert treatment being
necessary. Says Mr. Coupin:
"Most trees in our countries undergo a period of rest, during which
all growth appears to be suspended. Branches do not enlarge and the
buds on them remain as they are. They do not arouse from their
torpor until spring, first, because they then find the conditions
necessary for their development, and again, because, during the
period of rest, chemical changes have taken place in them. These are
indispensable, because if they did not occur, the trees, even in the
most favorable conditions, would not open their buds. For example,
plant branches that have quite recently dropped their leaves, in a
warm greenhouse. They will not bud; but make the same experiment at
the end of several months and the buds will appear.
"There are several ways of shortening this period of rest, some of
which are rather odd. The best known is the process of
etherification, which has been so much discussed recently, and which
consists in placing the plants to be forced in the vapor of ether or
chloroform for twenty-four to forty-eight hours. Afterwards when
placed in a hothouse, the branches begin to develop almost
immediately.
"A very ingenious botanist, Hans Molisch, professor in the
University of Prague, has devised a method of forcing, simpler still
and quite as effective. It consists in plunging the branches into
warm water during a time that varies with the species. The best
method is to plunge the plants in a reservoir of warm water, head
downward, without moistening the roots, which would injure them.
After a certain time, the plants are withdrawn, turned right side up
with care, and placed in a greenhouse, where they develop at once.
"The duration of the warm bath should be nine to twelve hours at
most. The best temperature is 30 degree to 35 degree [86 degree to
95 degree F] . . . That is to say, in the majority of cases, one may
simply employ the water available in hothouses, which is just at the
proper temperature. The process is thus at the disposal of all
gardeners.
"It should be said that the good effects of the hot baths are
confined to the parts actually immersed and do not extend to the
whole plant. Thus, on the same stem we may see developing only the
branches that have been treated with the bath, while the others
remain torpid. This is easy to verify with the lilac or the willow.
Public-domain text, read in full here on John Shaqi.
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