Ihave shown how this was bound up with the development of the lucerne farms themselves. The extreme west of the lucerne belt (Pedernera department and San Luis) is the only place where the cultivated area was reduced. The contracts by which the ranchers entrust their lands to the colonists, on condition of returning them sown with lucerne, were gradually modified as the stream of colonization developed. The land was at first left to the colonist rent free, the rancher being paid by the creation of the lucerne fields. But in proportion to the increasing volume of the stream of immigrants, and the keener competition of the colonists, the rancher asked better terms. There are similar contracts in regard to the restoration of lucerne fields which have been worn out by pasturage, so that the land has to be ploughed up periodically. The men who clear the land in the lucerne belt have mostly been recruited in the district of the old colonies of Santa Fe, where the new generation had begun to feel the pinch. The crops which they raise during the four or five years of their lease are chosen without any idea of sparing lands which they are not to keep. Wheat succeeds wheat, and the first and last crop is often flax. The proportion of flax is lower only in the southern part of the lucerne belt. In the Buenos Aires province the colonist grows lucerne on his own account, either to sell as dry fodder or for breeding or fattening. Colonization does not in these parts correspond with the division of property. Not only does the farmer not become the owner of the soil, but he does not live on it permanently; he is a veritable nomad. His house has a temporary look that strikes one at the first glance. The area cultivated is almost stable, if the region is considered as a whole. But cultivation passes periodically from one section to another, and its removals cause sudden alterations or crises in the railway traffic and the development of the urban centres. The lucerne belt has been peopled by Santafecinos, and it has in turn sent colonists to the western agricultural belt at the foot of the Sierras de San Luis and de Cordoba. They have less suitable climatological conditions, but they have the advantage of greater stability, as the breeders do not dispute the land with them.