I I I I i=f Scale fo inch equals 5 perceni

United Slates Statistical Atlas for the Census of 1900

Fig. 5. Elements of the Population of the United States in 1900

Here the components of the total population are shown in their relative sizes on the vertical scale. Each component is also divided into different subdivisions whose percentage size may be read from the horizontal scale. This is an admirable method of presentation if components must be subdivided

COMPONENT PARTS

TtoTAU Population, .76.303.367

Native White Nativc^Varents

. . .40,949,362

Native^wmitc foreign '^parents '

POREION WHITE 10,213.817 g S.znev'B'

NeORO .e.B34,094

^

Fig. 6. Conjugal Condition of the Population of the United States in 1900

The tour lower bars show components of the total population represented by the upper bar. The combined length of the four lower bars equals the length of the upper bar

is used, all the bars being made of equal width. In this particular case (Fig. 7) we have a total split into its components and again subdivided so as to show the prevalence of a second factor which is included in the first. Thus, we see the proportion of illiterates in each of the main groups of population for each State. All of the States are shown on the same basis, since all are depicted by bars of the same length representing 100 per cent. It is not easy to make a clear blackand-white drawing if one kind of cross-hatching must be placed on top of another kind. Fig. 7 shows that it is possible, however, to superimpose two kinds of cross-hatching and get a drawing that is fairly clear. The facts in this chart would have been brought out better if colors had been used for the main divisions of population. Ruled cross-hatching in black to represent the percentages of iUit-