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300 of letting out agri vectigules, that is, of leasing land for a perpetuity to a free tenant, at a fixed rent, and under certain conditions. The plan was afterwards extensively imitated by individual proprietors, and the tenant, whose relation to the owner had originally been determined by his contract, was subsequently recognised by the Prætor as having himself a qualified proprietorship, which in time became known as an Emphyteusis. From this point the history of tenure parts into two branches. In the course of that long period during which our records of the Roman Empire are most incomplete, the slave-gangs of the great Roman families became transformed into the coloni, whose origin and situation constitute one of the obscurest questions in all history. We may suspect that they were formed partly by the elevation of the slaves, and partly by the degradation of the free farmers; and that they prove the richer classes of the Roman Empire to have become aware of the increased value which landed property obtains when the cultivator had an interest in the produce of the land. We know that their servitude was predial; that it wanted many of the characteristics of absolute slavery, and that they acquitted their service to the landlord in rendering to him a fixed portion of the annual crop. We know further that they survived all the mutations of society in the ancient and modern worlds. Though included in the lower courses of the