_Preservation of Eggs._--Freshly laid eggs may be preserved for several days without any notable deterioration by keeping in a cool place. The temperature of preservation should be as nearly the freezing point as can be secured. The vital processes are continually going on in a fresh egg and hence there is a development of a certain degree of heat due to these activities. For this reason eggs can be placed in an atmosphere below the freezing point of water without being frozen. An additional reason for this is found in the fact that the water which is present in eggs holds the albumin and other bodies in solution and the freezing point of a solution is always lower than that of the solvent alone. For domestic purposes where refrigerating establishments are not available the fresh eggs should be kept in a cool dark place where the temperature is not allowed to go above 50 or 60 degrees. At a higher temperature than this fresh eggs lose their freshness in a remarkably short time. The porous nature of the shell is a condition which favors the deterioration of the egg by the admission of air and microbes into the substance of the egg itself. The preservation of eggs is, therefore, materially assisted by coating the egg artificially with a varnish or film of some kind which renders the egg impervious to air and water. One of the cheapest, simplest, and best of these coatings, as has already been noted, is soluble glass. This is produced by dissolving the chemical substance known as silicate of soda in water, and dipping the egg into the solution, removing and allowing to dry. The silicate of soda which is thus left in a thin film over the surface of the egg penetrates and stops the pores and renders the egg shell practically impervious both to air and water. This material has the property of becoming totally insoluble in water when it has once been dried so that even if the egg is afterwards subjected to rain or water in any form the film is not removed. Many other methods of coating eggs have been employed and are dependent upon the same principle but are perhaps not so effectual and simple as the inexpensive method above described.