§5. A lessee for years may assign over his whole interest to another, unless restrained by agreement not to assign without leave of the lessor. And he may underlet for any less number of years than he himself holds; but he is himself liable to the landlord. §6. A tenant for years, whose lease expires after the land is sown or planted, and before harvest, is not entitled to the crop, if the lease is for a certain period; for, knowing that his lease would expire before harvest time, he might have avoided the loss of his labor. But if the lease for years depends upon an uncertain event, the occurring of which would terminate the lease before the expiration of the term, the tenant would be entitled to the crop, if there were time to reap what has been sown, in case he should live. It is believed that, in a few states, the tenant has a right to the crop from grain sown in the autumn before the expiration of the lease, and cut the next summer after its expiration. §7. Where there is an express agreement to pay rent, the tenant can not avoid payment even if the premises are destroyed by fire or flood, or if he is in any other manner deprived of their enjoyment and use, even without any default on his part. Hence, if land should be leased with a flock of sheep, and the sheep should die, the full rent must be paid. But if the land should be recovered from the tenant by a person having a better title than that derived from his landlord, he is not liable for rent after his use of the land has ceased. §8. A tenant can not make repairs at the expense of the landlord, or deduct the cost of them out of the rent, unless by special agreement. But if the premises, from want of repair, have become unsafe or useless, the tenant from year to year may quit without notice; and he would not be liable for rent after the use had ceased to be beneficial. §9. When rent is due, payment may be made or tendered upon the premises; and if no place of payment has been agreed on, a personal tender off the land is also good. As to the time of payment, where there is no special agreement to the contrary, rent is due yearly, half-yearly, or quarterly, according to the usage of the country. Where there is no particular usage, the rent is due at the end of the year. §10. An _estate at will_ is where land is let to another, to hold at the will of the lessor. Tenancies at will, strictly such, are not common. Such estates, when no certain term is agreed on, are construed to be tenancies from year to year, and each party is bound to give reasonable notice of an intention to terminate the lease. If the tenant holds over after the expiration of a lease for years, either by express consent, or under circumstances implying consent, it is held to be evidence of a new contract without any definite period, and is construed to be a tenancy from year to year: and in those states where the old English rule prevails, six months' notice must be given the tenant to quit.