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PART I-METHODS EMPLOYED IN THE COLLECTION AND PRESENTA
TION OF DATA.
The present report is a summary presentation of the results obtained from the study of the operating forces of mines and manufacturing establishments. In preparing the data for publication six general divisions have been made. Part I, or the present section, sets forth the scope of the investigation and the methods employed in the collection of original statistical data. Part II includes a summarization of the salient facts developed by the study of the principal industries of the country arranged according to industries. Part III is a summary presentation of the statistical data by race without regard to industry; Part IV, the same, by general nativity groups and industry. Parts V and VI consist of the general number tables upon which the statistical material in Part II is based. All the material is presented according to the same method and by the same series of chapter headings, followed in the reports on selected industries in order that the data in all the industrial reports may be compared.
SCOPE AND METHOD OF THE INDUSTRIAL INVESTIGATION.
Geographical extent of the investigation-The principal branches of mining and manufacturing enterprise studied—Sources of information—Methods of investigation-The effect of the industrial depression.
GEOGRAPHICAL EXTENT OF THE INVESTIGATION.
The investigation of immigrants in industries included all the territory between the Rocky Mountains and Atlantic seaboard. The areas principally devoted to manufacturing or mining were obviously more intensively studied than those in which agriculture was the leading industry and manufacturing and mining subordinate. The States in which the investigation was prosecuted in the greatest detail were as follows: "
The principal branches of mining and manufacturing included in the investigation were as follows:
a A special study was made of Immigrants in Agriculture. See volumes 21 and 22.