It is easy to distinguish factors in the economic conditions in the northern and southern colonies which brought about these differences in the status of the slave in the two sections. In the trading colonies of New England and in the farming colonies of the Middle States the occupations in which slave labor could be profitably made use of were limited in number. The climate was too cool, especially for freshly imported slaves. Slave labor was ill adapted to the kind of crops the soil demanded. The status of the slave from the very nature of the case approximated that of the servant. The slaves became for the most part servants, the time of whose service was perpetual. The slaves of Pennsylvania, for this reason, were treated much more kindly than the Negroes in the West Indies. Their lot was doubtless far happier than that of the slaves in the lower South.[134] The conditions in the planting colonies from Virginia southward were different. Here was an unlimited supply of fertile lands which lent themselves readily to the unskillful and exhausting methods of slave labor. Here too was a warm climate congenial to the Negro, though enervating and often unhealthful for the white. The staples, such as the sugar cane, rice and later the cotton plant, were such as the unscientific slave labor might easily cultivate. All the conditions of profitable slave labor were present, namely, possibilities for concentration of labor, its absolute control and direction and exploitation. The status of the Negro in the planting colonies was the outcome of these economic conditions. He was deprived of the stimulating effect of personal intercourse with the white, enjoyed by the slave at the north. His status was fixed by a certain position in an industrial system, the tendency of which was to attach him more and more to the soil and, especially on the larger plantation, to make of him a "living tool." He became, as time went on, the economic unit. Even free labor, in so far as it survived slave labor, was forced to take its measure of values from the slave. There were of course gradations in status even among the slaves in the lower South so that the same system could include the conditions described in Fanny Kemble's _Journal of a Residence on a Georgian Plantation_ as well as those portrayed in Smedes' _Memorials of a Southern Planter_. If we take the whole sweep of country from New England to the far South, the differences in the status of the slave varied still more, including the exceedingly mild form of slavery in Pennsylvania where the slave was not essentially different from the indentured servant, the patriarchal slavery of Virginia, as well as the capitalistic exploitation of slave labor in the great rice plantations of South Carolina and Georgia and the cotton and cane plantations of Mississippi and Louisiana. Here, in some cases at least, the West Indian conditions were approximated. In the lower South particularly