Because eggs are spoiled by hard freezing, they must be kept at a higher temperature than meat and butter. Temperatures of from 29 degrees to 30 degrees F. are used in cold storage of eggs. At such temperatures the eggs, if kept in moist air, become moldy or musty. To prevent this mustiness the air in a first class storage room is kept moderately dry. This shrinks the eggs, though much more slowly than would occur without storage. The growth of bacteria in cold storage is practically prevented, but if bacteria are in the eggs when stored they will lie dormant and begin activity when the eggs are warmed up. Of the cold storage egg as a whole we can say it is a wholesome food product, though somewhat inferior in flavor and strength of white to a fresh egg. The cold storage egg can be very nearly duplicated in appearance and quality by allowing eggs to stand for a week or two in a dry room. Cold storage eggs, when in case lots, can be told by the candler because of the uniform shrinkage, the presence of mold on cracked eggs and perhaps the occasional presence of certain kinds of spot rots peculiar to storage stock, but the absolute detection of a single cold storage egg, so far as the writer knows, is impossible. It may be further said that with the present prevailing custom of holding eggs without storage facilities for the fall rise of price, eggs placed in cold storage in April are frequently superior to the current fall and early winter receipts. Cold storage eggs are generally sold wholesale as cold storage goods, but are retailed as "eggs." The fall eggs offered to the consumer cover every imaginable variation in quality and the poorest ones sold may be a cold storage product, or they may not be. The Bureau of Chemistry of the United States Department of Agriculture has recently announced the finding of certain crystals in the yolks of cold storage eggs that are not present in the fresh stock. This finding of a laboratory method of detecting cold storage stock was at first taken to be a great discovery. Further investigation, however, indicates that the crystal mentioned forms as the egg ages and that the rate of formation varies with the individual eggs and probably also with the temperature, so that while crystals may indicate an aged egg, the discovery only means that the microscopist in the laboratory can now do in a half hour what any egg candler in his booth can do in ten seconds.