The red color of leaves found in nature during various seasons has long intrigued scientists and laymen alike. The voluminous literature is also evidence of the interest the phenomenon has aroused. Onslow's 'Anthocyanin Pigments of Plants' and 'The Biological Effects of Radiation,' edited by Dugger are the two most exhaustive books on the chemical and physical aspects of anthocyanin. Lippmma came to the conclusion that anthocyanin plays a role of protection and that it is a genetically controlled characteristic of plants. It is thought by some that the pigments aid in temperature rise and thus cause increased transpiration. Chemically, the anthocyanin pigments occur in a number of forms. The most common two are found in beets and grapes.