The object of the illustration is to show the necessity of a road system that will feed from the farms to the densely settled portion, permit the quick and easy transportation of farm products to the cities, lessen the cost of living, and thus justify the taxing of the State as a whole for the construction of this system

corrected by pulling out pins. Also, if there should be a reduction in the density of the population, pins can be pulled out, whereas with the pen-and-ink method of Fig. 181 it is not possible to proceed backward on the scale of marking and a decrease can never be shown without making another map or marring the old one.

In Fig. 182 is seen a good example of the graphic method applied to newspaper writing designed to convince the reader by specific argument. The presentation is very effective. The shaded portion of the map shows a strip which contains 90 per cent of the taxable valuations and 80 per cent of the population. The possibilities for the use of maps in arguments of political or economic nature are almost

MAP PRESENTATIONS

without limit. It is rather surprising that maps for such purposes have not been more generally employed.

Though the map record sheet shown in Fig. 183 may appeal to some business men, there would seem to be little advantage in that type of sheet over tabulated figures in a column. The column arrangement would have a desirable feature in that different entries could more easily be compared for size by judging the number of digits contained in each entry.