=Cold storage of poultry products.= So abundant are the supplies of eggs in the spring, and of some kinds of dressed poultry in the summer, fall, and early winter, that large quantities could not be sold at any price at seasons of plenty if there were no way of keeping them until a season of scarcity. For about half a century after the production of eggs and poultry began to receive special attention in this country, the profits of the ordinary producer were severely cut every spring and fall, because the market was overstocked. Consumers derived little benefit from this situation, because they could not use the surplus before it spoiled. The popular idea of the way to remedy the conditions was to have hens lay when eggs were scarce, and to have poultry ready for sale when supplies were insufficient. Experience, however, has shown that it is practically impossible to have a very large proportion of things of this kind produced out of their natural season. The relatively small numbers of people who succeed in doing so make very good profits, but the masses of producers and consumers are not benefited. The solution of the problem of carrying the surplus of a season of abundance to a season of scarcity was discovered when methods of making ice artificially were perfected and it was found that the equipment used in manufacturing ice could be used to cool, to any desired degree, rooms for the storage of perishable produce. This form of refrigeration was at first used in place of the ordinary method (with natural ice), to keep goods for short periods. Much larger quantities could be taken care of in this way when for any reason a market was temporarily overstocked.