These societies consist, as has been explained, of groups of farmers who have been taught by organisers that certain branches of their business can be more profitably conducted in association than by individuals acting separately. The principle of agricultural co-operation with its economic advantages will, as time goes on, be further extended by the combined action of societies. With this end in view federations are constantly being formed with a constitution similar to that of the societies, the only difference being that the members of the federation are not individuals but societies, the government of the central body being carried on by delegates from its constituent associations. The two largest of these federations, one for the sale of butter, and another for the combined purchase by societies of their agricultural requirements, have been working successfully for several years. Federations, too, are being formed, as societies find that their business can be conducted more economically, for example, in dairying by centralising the manufacture of butter, or in the egg export trade by the alliance of many districts to enable large contracts to be undertaken. In the near future a further development of federation will be required to complete a scheme now under consideration for the mutual insurance of live stock. Such a scheme involves the existence of two prime conditions, a local organisation for the purpose of effective supervision, and the spreading of the risk over a large area. In all such enterprises and economic changes the Organisation Society is either the initiator, or is called in for advice, and its continued existence in a purely advisory capacity as a link between the societies where concerted action is required, will be necessary even when the organisation of farmers into societies is completed. The economic life of rural communities is in continual need of adjustment. Now it is an invention like a steam separator which revolutionises an industry. At another time the crisis created by a change in the tariff of a foreign country forces the producer either to find a new outlet for his wares, or to abandon a hitherto profitable employment. A striking instance of the value of organisation and connection with a central advisory body occurred in 1887, when swine fever broke out in Denmark, and the exports of live swine fell from 230,000 in one year to 16,000 in the next. The organisation of the farmers, however, enabled them easily to consult together how best to meet the emergency, and their decision to start co-operative bacon-curing factories was the foundation of their present great export trade in manufactured bacon.