A lease is the instrument used to create estates less than freehold, and usually contains a reservation of rent. At common law, however, the term was applied to conveyances of particular estates as for life as well as estates in fee simple in which a rent was reserved.45 By the early common law no writing was necessary for a lease, though an entry was.46 Now, however, by the statute of frauds, there must be a writing when the lease is for more than a short period, which differs in the various states.47 Leases have already been considered more fully in treating of estates less than freehold.48