A. Causes of tides.
B. Condition of interior of earth.
C. Causes of mountain growth.
D. Details of glaciation.
E. Geological development of continent.
4. Method in Large.
A. Work should be developed, as far as possible, as result of map work and personal observations.
B. Principles should be illustrated as widely as possible to show general importance.
C. Some topics may readily be studied in association with study of Africa or Australia, and thus training may be given in working from causes to consequences, as preliminary to later use of definite causal order.