Slavery, then, being the creature of positive legislation alone, can be created only by legislation that shall so particularly describe the persons to be made slaves, that they may be distinguished from all others. If there be any doubt left by the _letter_ of the law, as to the persons to be made slaves, the efficacy of all other slave legislation is defeated simply by that uncertainty. In several of the colonies, including some of those where slaves were most numerous, there were either no laws at all defining the persons who might be made slaves, or the laws, which attempted to define them, were so loosely framed that it cannot now be known who are the descendants of those designated as slaves, and who of those held in slavery without any color of law. As the presumption must--_under the United States constitution_--and indeed under the state constitutions also--be always in favor of liberty, it would probably now be impossible for a slaveholder to prove, in one case in an hundred, that his slave was descended, (through the maternal line, according to the slave code,) from any one who was originally a slave within the description given by the statutes. When slavery was first introduced into the country, there were no laws at all on the subject. Men bought slaves of the slave traders, as they would have bought horses; and held them, and compelled them to labor, as they would have done horses, that is, by brute force. By common consent among the white race, this practice was tolerated without any law.--At length slaves had in this way become so numerous, that some regulations became necessary, and the colonial governments began to pass statutes, which _assumed_ the existence of slaves, although no laws defining the persons who might be made slaves, had ever been enacted. For instance, they passed statutes for the summary trial and punishment of slaves; statutes permitting the masters to chastise and baptise their slaves,[9] and providing that baptism should not be considered, in law, an emancipation of them. Yet all the while no act had been passed declaring who might be slaves. Possession was apparently all the evidence that public sentiment demanded, of a master's property in his slave. Under such a code, multitudes, who had either never been purchased as slaves, or who had once been emancipated, were doubtless seized and reduced to servitude by individual rapacity, without any more public cognizance of the act, than if the person so seized had been a stray sheep.