MODELS AND MAPS 



143 



readily to the eye the general character of the relief of the ground, 

 and while it brings out the steepness or gentleness of the slopes, it 

 is only possible to indicate actual heights by the insertion of figures 

 giving the height in feet, or to infer the approximate height from 

 a close study of the length, closeness, and thickness of the 

 hachures. In other words, the relief is expressed in quality 



FIG. 41. Portion of Fig. 39 to show the effect of submerging the country 

 200 feet. Compare Fig. 44. 



rather than in amount, and it is not easy to adopt or adhere 

 to any method for giving the exact quantitative value of the 

 relief by this means. 



For this purpose another method is required, and that of con- 

 touring has proved itself to be the best. Great pains should be 

 taken to secure the thorough understanding of this method. 



