The habit of locating the events recorded, of tracing upon the map the route of an army, or the line of an important road or canal, and observing the impediments or natural obstructions to be overcome, with the great advantages to be derived therefrom, together with inferences as to the time and labor required, has the effect of making the study of history of living interest, especially if the map used indicates such surface structure.

In the structural map the student readily sees the meaning to commerce of the cutting of a canal which would unite two large bodies of water, or the effect the building of roads and bridges across hitherto impassable regions would have upon the life and growth of a people in the opening up of new and extensive areas to civilization, and consequently the development of their own internal resources.

The importance of this habit of usage, or constant reference to the map, is also recognized when one realizes how it fixes in the memory not only the location of cities and boundaries of ancient empires, but the geographical structure and environment associated with their growth and with important historic events; making plain the reasons for, or causes why, certain events occurred at certain places, as the inevitable consequence of their environment.

Light dawns upon the pupil as he studies. He sees that environment has been an important factor in the development of the human race. He traces step by step in imagination the growth of civilization, from the time that man in his nomad stage first drove his herds into the valley in search of food and water. There, finding the soil productive, water unfailing in supply, and the valley protected from marauders by natural barriers, as desert or mountain walls, he fixes his home; in the course of time comfortable dwellings are constructed, land is cultivated and the place becomes a center of civilization.

In connection with this train of thought, the student by contrast notes the far different effects of environment as shown by life in the Arctic or other regions, and he turns to his map with renewed interest and eager inquiry.

Literature. The habit also of locating on the map every place, natural feature or country read about, should be cultivated, as it is of importance in obtaining a correct understanding of an author’s meaning.

If we did not have the knowledge of physical structure in mind as a stage on which the actors move, much of our literature would lose its value, becoming flat and uninteresting.

To know the great lake region adds to one’s interest in Longfellow’s “Hiawatha,” and the tales of the early explorers; and a knowledge of the Catskills and the geography of the Hudson River valley gives greater zest to the enjoyment of Irving’s “Rip Van Winkle” and “Sleepy Hollow.”

It is also necessary to the understanding of the stories of Holland (“Hans Brinker”) that we know the habits of the Hollanders arising from the physical characteristics of their environment.