teel works, rolling mills, and related industries 170

XVII. THE BUILDING TRADES 173
Sources of labor supply 173
Apprenticeship 174
Union organization 176
Earnings 176
Hours 178
Regularity of employment 179
Health conditions 179
Opportunities for advancement 180
The problem of training 181

XVIII. RAILROAD AND STREET TRANSPORTATION 187
Railroad transportation 187
Motor and wagon transportation 192
Street railroad transportation 193

XIX. THE PRINTING TRADES 195
The composing room 198
The pressroom 201
The bindery 203
Other occupations 204
The problem of training 206

LIST OF TABLES

TABLE PAGE
1. Occupational distribution of the working population
of Cleveland 26

2. Nativity of the working population in Cleveland 27

3. Pupils enrolled in the different grades of the public
day schools in June, 1915 30

4. Enrollment of high school pupils, second semester,
1914-15 31

5. Ages of pupils enrolled in public elementary, high,
and normal schools in June, 1915 33

6. Educational equipment of the children who drop out
of the public schools each year, as indicated by
the grades from which they leave 35

7. Per cent of total male working population engaged in
specified occupations, 1900 and 1910 40

8. Distribution of native born men between the ages of
21 and 45 in the principal occupational groups