If the early "originals" are one-step exercises, and a pupil is required
to recite rapidly, a habit of quick expression is easily acquired that
leads to close attention on the part of all the class. Students as a
rule recite slower than they need to, from mere habit. Phlegmatic as we
think the German is, and nervous as is the American temperament, a
student in geometry in a German school will usually recite more quickly
and with more vigor than one with us. Our extensive blackboards have
something to do with this, allowing so many pupils to be working at the
board that a teacher cannot attend to them all. The result is a habit of
wasting the minutes that can only be overcome by the teacher setting a
definite but reasonable time limit, and holding the pupil responsible if
the work is not done in the time specified. If this matter is taken in
hand the first day, and special effort made in the early weeks of the
year, much of the difficulty can be overcome.
As to the nature of the recitation to be expected from the pupil, no
definite rule can be laid down, since it varies so much with the work of
the day. In general, however, a pupil should state the theorem quickly,
state exactly what is given and what is to be proved, with respect to
the figure, and then give the proof. At first it is desirable that he
should give the authorities in full, and later give only the essential
part in a few words. It is better to avoid the expression "by previous
proposition," for it soon comes to be abused, and of course the learning
of section numbers in a book is a barbarism. It is only by continually
stating the propositions used that a pupil comes to have well fixed in
his memory the basal theorems of geometry, and without these he cannot
make progress in his subsequent mathematics. In general, it is better to
allow a pupil to finish his proof before asking him any questions, the
constant interruptions indulged in by some teachers being the cause of
no little confusion and hesitancy on the part of pupils. Sometimes it is
well to have a figure drawn differently from the one in the book, or
lettered differently, so as to make sure that the pupil has not
memorized the proof, but in general such devices are unnecessary, for a
teacher can easily discover whether the proof is thoroughly understood,
either by the manner of the pupil or by some slight questioning. A good
textbook has the figures systematically lettered in some helpful way
that is easily followed by the class that is listening to the
recitation, and it is not advisable to abandon this for a random set of
letters arranged in no proper order.
Public-domain text, read in full here on John Shaqi.
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