VENTILATING REFRIGERATOR CARS.--In some cars there is no provision for renewal of the air; the object is, no doubt, economy of ice, and for very low temperature, or for short trips, it is an advantage which does not have any ill effects on the contents of the car. For long trips and moderate temperatures, a change of air is beneficial, in most instances. In some cars, ventilation is so arranged that the air can be changed or not, as desired. The fans are run by motion taken from one of the car axles, and are arranged to be run by hand when the car is not in motion. ICING REFRIGERATOR CARS.--When a train is to be loaded with beef or mutton, it is set in on a track alongside of the icing platform. By means of double tracks on either side, as many as fifty cars can be iced at short notice. Ice cakes are delivered on a staging above the platform by elevator, suited to the location, and run into the hopper of a large power ice breaker. Barrows, of a capacity of five hundred pounds of broken ice, are set below the breaker, and, by withdrawing the damper, are filled with ice. From two to four shovelfuls of salt are added, and the barrow is dumped into the mouth of a chute which runs along the edge of the platform, delivering the ice directly into the door above the ice tank. About four tons of ice are placed in each car. By an extension spout the cars are filled in the same manner on the farther tracks. After icing, the cars are loaded, and at intervals on their journey the ice is replenished. In shipping other goods, which are not wanted below the freezing point, ice is used without salt. Even with such goods, the more frequent use of ice would often be advisable. VALUE OF ICE IN TRANSPORTATION.--It is difficult to imagine the state of affairs which would ensue upon a withdrawal of all refrigerator service upon our railways. The amount of privation and actual suffering which would follow would be felt directly in every community in the land. To most people the blessings which follow in the wake of the refrigerator car are of a kind which are accepted without question, as a matter of course. It would be a long list, to enumerate all the advantages which are now mutually divided between the producer and the consumer of the products of our farms, gardens, vineyards, dairies and fisheries, dependent, in whole or in part, upon this service. It is but a short time since hundreds of bushels of fruit were left to decay on the ground in California orchards, while many other sections were destitute of fruit. Now a refrigerator car service delivers these fruits at all the Atlantic coast cities, as well as points between. Trial shipments have been despatched to London, with gratifying results, and it is more than probable that large quantities of the products of these famous orchards will delight our cousins across the sea.