grow in the measure indicated by the earlier
experience.

Thus far we have concerned ourselves chiefly with those figures which
exhibit the extent of investment and production, but there is another
and humanly important side that presents itself for consideration
namely, the employment of a vast industrial army of men and women,
who earn a living through their connection with some of the arts and
industries to which our narrative has direct reference. To this the
reader's attention will now be drawn.

The following figures are based upon the Special Reports of the Census
Bureau, 1902 and 1907, with additions computed upon the increase that
has subsequently taken place. In the totals following is included the
compensation paid to salaried officials and clerks. Details relating to
telegraph systems are omitted.

Taking the electric light into consideration first, we find that in the
central stations of the United States there are not less than an average
of 50,000 persons employed, requiring an aggregate yearly payroll of
over $40,000,000. This does not include the 100,000 or more isolated
electric-light plants scattered throughout the land. Many of these
are quite large, and at least one-third of them require one additional
helper, thus adding, say, 33,000 employees to the number already
mentioned. If we assume as low a wage as $10 per week for each of
these helpers, we must add to the foregoing an additional sum of over
$17,000,000 paid annually for wages, almost entirely in the isolated
incandescent electric lighting field.

Central stations and isolated plants consume over 100,000,000
incandescent electric lamps annually, and in the production of these
there are engaged about forty factories, on whose pay-rolls appear
an average of 14,000 employees, earning an aggregate yearly sum of
$8,000,000.

Following the incandescent lamp we must not forget an industry
exclusively arising from it and absolutely dependent upon it--namely,
that of making fixtures for such lamps, the manufacture of which gives
employment to upward of 6000 persons, who annually receive at least
$3,750,000 in compensation.

The detail devices of the incandescent electric lighting system also
contribute a large quota to the country's wealth in the millions of
dollars paid out in salaries and wages to many thousands of persons who
are engaged in their manufacture.

The electric railways of our country show even larger figures than the
lightin