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Cities 25000 to 35,000 People ^Figures based on average daily attendance)

Fig. 20 gives a diagram taken from another geography book. This is a much better form of presentation than used in Fig. 19. It could, however, be improved by giving the figures for each country in connection with its own. bar.

Fig, 21 shows the horizontalbar method applied to a larger number of items and proves the great utility of this method when several different items must be shown in their proper rank. In this case, however, the figures should have been given for the convenient use of any one who might wish to make ratios or to quote the actual value of products

for any one of the cities. It is exasperating to run across a diagram of this kind which contains valuable information in such form that it cannot be carried away or quoted for use elsewhere.

In Fig. 22 an attempt has been made to show in the graphic presentation the figures from which each horizontal bar was drawn. The method of placing the figures at the right of the bar is, however, unsafe. The eye is likely to make a comparison, not from the ends of the bars themselves, but from the right-hand end of the figures. Since the figures are of about constant length, visual ratios are inaccurate when made by comparing a short bar plus the constant length of figures with a long bar plus the constant length of figures. If the shortest bar in Fig. 22 were about the same length as the space