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 43. From this it follows that education cannot attain to thoroughness without frequent and suitable repetitions of and exercises on the subjects taught. We may learn the most suitable mode of procedure by observing the natural movements that underlie the processes of nutrition in living bodies, namely those of collection, digestion, and distribution. For in the case of an animal (and in that of a plant as well) each member seeks for digestion food which may both nurture that member (since this retains and assimilates part of the digested food) and be shared with the other members, that the well-being of the whole organism may be preserved (for each member serves the other). In the same way that teacher will greatly increase the value of his instruction who

(i) Seeks out and obtains intellectual food for himself.

(ii) Assimilates and digests what he has found.

(iii) Distributes what he has digested, and shares it with others.

44. These three elements are to be found in the well-known Latin couplet:—

Questioning takes place when a pupil interrogates his teachers, his companions, or his books about some subject that he does not understand. Retention follows when the information that has been obtained is committed to memory, or is written down for greater security (since few are so fortunate as to possess the power of retaining everything in their minds). Teaching takes place when knowledge that has been acquired is communicated to fellow-pupils or other companions.

With the two first of these principles the schools are quite familiar, with the third but little; its introduction, however, is in the highest degree desirable. The saying,