There must be, and it is almost impossible to over-emphasise this, a certain sequence, a certain gradation, a definite plan, on which the lessons are arranged; but this plan, this sequence should be the teacher’s own, it should be the outcome of his own individuality; he will best teach what most interests him, hence he had better follow his own order than that of any text-book, however excellent. In higher classes, where the work is arranged on examination lines, the teacher has a definite syllabus for his guidance; but even in this case there is play for his individuality, and nothing can dispense with this. He must be always reading the new books on his subject; he must keep himself in touch with the new work that is being done through visiting museums, botanical gardens, working in laboratories, etc., so as to be keen about his subject, otherwise his lessons will be dull and lifeless, and the unforgivable sin in a teacher is dulness.
Science cultivates the faculties of imagination and reasoning.Although teachers of biology will naturally attach much importance to the development of observation, it is very necessary to remember that observation is only a means to an end, not an end in itself. If teachers aim only at cultivating the faculty of observation, they are likely to produce pupils who will make good collectors (a work not to be despised), but nothing more. The accurate observation of facts is absolutely necessary, but it is by no means the only thing to be done in science teaching. The power of generalisation, from the facts collected, should follow if science is to advance at all. It may be thought that this cannot be done in school work, but surely some attempt should be made in this direction, for it is most necessary that pupils should be taught to understand, to some extent at any rate, when a generalisation is sound and when unsound. This is specially the case in teaching physiology; for instance, pupils are most interested in hearing something of the cell theory of the body, and can quite appreciate the bearing of the discovery, that the walls of the capillary blood-vessels are composed of cells, on this theory.
Science is not a matter merely of memory and accurate observation, it needs considerable reasoning power and much imagination, for without the power of seeing resemblances in facts, i.e., true induction, progress is impossible. The theory of evolution, which has revolutionised not only science, but the whole thought of the present day, could never have been formulated had Darwin and Wallace been mere observers, however accurate, and in this connection a science teacher may be allowed to bear witness to the importance of the Humanities in the training of the mind. As a scholar of Shrewsbury Grammar School, Darwin had little training in science, but possibly without the mental discipline of the classics, he would have been unable to accomplish what he did for science in later life; for the higher walks of science require much imagination. In science lessons pupils may be called on to devise experiments for themselves, to invent diagrams, to find out resemblances, to note dissimilarities, in order to develop the faculty of imagination. Speaking very generally, in younger classes the aim of the teacher will be to cultivate the faculty of observation, in the upper to develop not only observation, but the imagination and power of reasoning.
Notes of a Specimen Lesson on Growth of Seedlings for Senior Oxford Class.
Time—one hour.
In a previous lesson the structure of the seed of bean, maize and sunflower has been given.
Material required:—
A. Seedlings of bean, maize and sunflower, ten days old; one of each kind for each pupil.
B. Seedlings of the above, three weeks old.
C. Seedlings grown in different media; water, sawdust, soil.