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Rh with which they are already acquainted; if they have never seen any, they may be asked about water running in gutters. Somehow "apperceptive masses" are stirred that will assist in getting hold of the new subject. The step of preparation ends with statement of the aim of the lesson. Old knowledge having been made active, new material is then "presented" to the pupils. Pictures and relief models of rivers are shown; vivid oral descriptions are given; if possible, the children are taken to see an actual river. These two steps terminate the acquisition of particular facts.

The next two steps are directed toward getting a general principle or conception. The local river is compared with, perhaps, the Amazon, the St. Lawrence, the Rhine; by this comparison accidental and unessential features are eliminated and the river concept is formed: the elements involved in the river-meaning are gathered together and formulated. This done, the resulting principle is fixed in mind and is clarified by being applied to other streams, say to the Thames, the Po, the Connecticut.

If we compare this account of the methods of instruction with our own analysis of a complete operation of thinking, we are struck by obvious resemblances. In our statement (compare Chapter Six) the "steps" are the occurrence of a problem or a puzzling phenomenon; then observation, inspection of facts, to locate and clear up the problem; then the formation of a hypothesis or the suggestion of a possible solution together with its elaboration by reasoning; then the testing of the elaborated idea by using it as a guide to new observations and experimentations. In each account, there is the sequence of (i) specific facts and