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Updated: June 25, 2025
It is difficult to estimate the extent of the latter, for, being more noticeable than good land, the tendency is to overestimate. Its proportion to arable land is generally put at about 50 per cent., which may be over or under the truth, for only actual township or topographic surveys can determine it.
PHYSIOGRAPHIC EFFECTS OF INTRUSIVE MASSES. We have already seen examples of the topographic effects of intrusive masses in Mount Hillers, the Spanish Peaks, and in the great mountain ranges mentioned in the paragraph on regional intrusions, although in the latter instances these effects are entangled with the effects of other processes.
Whole sections of territory which were uninhabited ten years ago are thick with farms today and the 'Great American Desert' of a few years ago is becoming, under irrigation, the 'Great American Garden." "The Survey maps helped, I should think," said Hamilton. "I have a friend, Roger Doughty, on the Geological Survey, and he told me all about the making of the Topographic maps."
The "Systeme Glaciaire" was, on the contrary, an account of a connected plan of investigation during a succession of years, upon a single glacier, with its geodetic and topographic features, its hydrography, its internal structure, its atmospheric conditions, its rate of annual and diurnal progress, and its relations to surrounding glaciers.
To follow their course is to enlarge the mind not by stuffing it with additional information, but by remaking the meaning of what was previously a matter of course. The same principle coordinates branches, or phases, of geographical study which tend to become specialized and separate. Mathematical or astronomical, physiographic, topographic, political, commercial, geography, all make their claims.
A year of holiday practice in such work will, if the tasks occupy somewhere about a hundred hours of his time, serve greatly to extend or reawaken what may be called the topographic sense, and enable him to place in terms of space the observations of Nature which he may make. In his more detailed work the student should select some particular field for his inquiry.
P. G. Hamerton, England’s safest and surest critic of art, writing a generation ago on the “Relation between Photography and Painting,” says: “But all good painting, however literal, however pre-Raphaelite or topographic, is full of human feeling and emotion.
In other words, the point, or primary germ of extension, corresponds, according to the theory of M. Pétin, with the fulcrum, or primary condition of locomotion; the line, first and simplest form of extension, corresponds with locomotion on the surface of the earth, where, owing to topographic inequalities, and other obstacles, locomotion can take place only in its first and simplest mode namely, in a linear direction; the plane, produced by the movement of the line, and constituting a higher term of superficial development, corresponds with locomotion upon the water, whose unencumbered surface, which can be traversed in every direction, presents a locomotive medium, the facilities of which, compared with those offered by the surface of the earth, increase in the ratio of the difference of extension between the line and the plane.
To-day we go to the summit of the cliff on the left and take observations for altitude, and are variously employed in topographic and geologic work. May 29. This morning Bradley and I cross the river and climb more than a thousand feet to a point where we can see the stream sweeping in a long, beautiful curve through the gorge below.
It is believed that the cliff ruins and cavate lodges, which are merely variants of each other due to geological conditions, were simply farming shelters of another type, produced by a certain topographic environment. The importance which it is believed should attach to the site on which a ruin is found will be apparent from the above. It was certainly a prominent element in the De Chelly group.
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