Of course many planters run their own plantations; but on all large estates, and many small ones, there is a manager who is virtually the old overseer over again. Commonly he is a good specimen of the lower class of the white population; in a very few cases he is a Negro. Successful managers command a salary as high as $3,000 a year or more, and have some opportunity to plant on their own account; business sense such a man must have, but above all he must be able to "handle niggers," an art in which, by common consent, most Northern owners of cotton land are wanting. On a large plantation there will also be one or more assistant managers, commonly called "riders"; a bookkeeper, who may be an important functionary; a plantation doctor, sometimes on contract, sometimes times taking patients as they come and charging their bills on the books of the plantation. On one plantation employing a hundred and thirty Italian families there is even a plantation priest. The manager subdivides the estate into plots, or "plows"--you hear the expression "he has a fifteen-plow farm"--of from ten to thirty-five acres, according to the number of working hands in the squad that takes it. A "one-mule farm" is about thirty acres. He settles what crop shall be grown; some insist that part of the acreage be planted in corn, others raise all the corn for the estate on land worked by day hands. The secret of success is unceasing watchfulness of all the details, and especially of the labor of the hands. Outside of the administrative force and their families there are commonly no white people on a cotton plantation. The occasional white hands make the same kind of contracts, live in the same houses, and accept the same conditions as the Negroes; but their number is small and they are likely to drift out either into cotton mills or into sawmill and timber work. The foreign agricultural laborers, as has been shown in the chapter on immigration, are few in number. The Germans, the so-called Austrians, the few Bulgarians, Greeks, Syrians, and Italians, all taken together, are probably less than 10,000, and there seems little reason to suppose that their number will soon increase. The main source of plantation labor has always been the Negroes who furnish about two million workers on other people's land, and with their families make up more than half of all the Negroes in the United States.