The present status of our knowledge of the stability of vitamins -2 and C in fruits and vegetables when subjected to varied conditions of storage and freezing are given here in the form of a review of investigations and original data. It is hoped that the facts presented will give a clearer conception of the effect of certain environmental factors on the vitamins. Frozen fruits and vegetables are becoming more and more widely consumed and form an important addition to the human dietary. Retention of the vitamins in these processed foods is of the greatest health interest.Until recently it has been impossible to evaluate exactly the vitamin values of foods obtainable on the market because the standard tests using the biological or animal-survey methods could not always detect variations such as are caused by maturity, variety, locality, or temperature of exposure.With the discovery by Tillmans, I-Iirsch, and IIirsch (1932) of the rapid chemical method of determining vitamin C and its rapid development and improvement by many laboratories, investigations on the effect of environmental conditions, such as storage, processing, and cooking, have been greatly stimulated. Similarly, recent development of spectrophotometric and chemical methods for the determination of vitamin A and carotene has led to a renewed interest in the vitamin A content of foods and the effect of various factors involved in food distribution and preparation of this vitamin. Vitamin A, however, has been far less concerned in food research during the past few years than vitamin C. Reviews of quantitative data on the occurrence of vitamins in fresh and processed foods have been published by Fellers (1936) and by Daniel and Munsell (1937). Because of the newness of suceessful freezing methods, relatively fewer investigations have been conducted on the effect of freezing than on the various heat treatments.