Ontario Teachers' Manuals: Nature StudyOntario. Department of Education
Science
Ontario Teachers' Manuals: Nature Study
Ontario. Department of Education
Nature study; Science -- Study and teaching (Elementary) -- Ontario
Let the pupils provide themselves with sharp knives for the lesson, with
small boxes or pots, and with some moist, clean sand--not potting soil.
A few holes should be bored in the bottom of the box, then a layer of
fine gravel put in to provide for good drainage, and over it layers of
moist sand. Take a slip or growing end of a stem about three inches in
length, always cutting it at or just below a node, or joint, and
leaving only a couple of small leaves on the top of the slip. Insert it
to about half its depth in the box of moist sand. These cuttings may be
placed a few inches apart in the box, which should then be placed in a
warm, light room for a few weeks until the roots develop. The cuttings
should be partly shaded by papers from the strong sunlight, and the sand
kept slightly moist but not wet. Bottom heat and a moist, warm
atmosphere hasten their development.
Another very convenient and very successful method of starting cuttings
is to take a six-inch flower-pot, put two inches of fine gravel in the
bottom, set a four-inch unglazed flower-pot in the centre, and fill up
the space around it with sand and garden-loam, mixed. Put a cork in the
hole in the bottom of the small flower-pot, and then fill it with water.
Put the cuttings around in the space between the two pots and set in a
fairly warm room in moderate light.
POTTING OF ROOTED CUTTINGS
When the cuttings are well rooted, which requires from three to six
weeks according to the variety and growth conditions furnished, they
should be carefully lifted with a trowel and each set in a small pot or
can. First put in the bottom a few small stones to secure drainage, and
then a little good potting soil. Set the plant in place and fill in
around with more soil and pack this firmly around the roots. Keep room
in the top of the pot for water. When the new plant has made some
growth, it may be shifted to a larger pot. Geraniums and coleus (foliage
plants) should not be kept more than two seasons. Take cuttings off the
old plants and then throw the latter away.
EVERGREENS
In December make a study of Canadian evergreens, choosing spruce,
balsam, and cedar, if available, or substitute hemlock for any one of
these.
Compare the general features of these trees, such as shape, direction of
branches, colour, persistence of leaves through the winter.
Have the pupils notice how nature fits these trees to endure the snows
and storms of winter by:
1. The tapering cone which causes the snow to slide off the tree.
2. The fine, needle-shaped leaves to which only very sticky snow will
adhere.
3. The very tough, flexible, and elastic branches, which bend in the
wind and under the weight of snow, but spring back to their old
positions.
4. The resin in leaves, stems, and buds, which enables the trees to
resist frost and rain.
Teach the pupils to distinguish these trees by their differences in
colour and form and also by the differences in their leaves and cones.
CLASS-ROOM LESSON
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