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Hard and fast rules for the use of these maps can no more be laid down than for any other part of the teacher's work. Pupils are living human beings, with varying dispositions, intelligences, and previ ous preparation; school systems differ widely from one another; and the teacher must work according to his circumstances and his special gifts. The suggestions which follow, however, will perhaps be of some service. As to aims in the use of the maps, the following points should be borne in mind.