Excerpt from Genetics of Sugar Maple Stebbins, G. L., Jr. 1950. Variation and evolution in plants. Columbia Univ. Press, New York, 643 pp. Stevenson, D. D and Bartoo, R. A. 1940. Comparison of the sugar percent of sap in maple trees growing in open and dense groves. Pa. State Forest Sch., Res. Pap. 1, 3 pp. Stoeckeler, J. H., and Jones, G. W. 1957. Forest nursery practice in the Lake States. Usda Forest Serv., Agr. Handbook 110, 124 pp. Stout, A. B. 1928. Dichogamy in flowering plants. Bull. Torrey Bot. Club 55: 141 - 153. Taylor, F. H. 1956. Variation in sugar content of maple sap. Vt. Agr. Exp. Sta. Bull. 587, 39 pp. Taylor, W. R. 1920. A morphological and cytological study of re production in the genus Acer. Univ. Pa. Bot. Lab. Wallihan, E. F. 1949. Plantations of northern hardwoods-some fac tors influencing their success. Cornell Univ. Agr. Exp. Sta. Bull. 853, 31 pp. Wilde, S. A., and Patzer, W. E. 1940. Soil-fertility standards for growing northern hardwoods in forest nurseries. J. Agr. Res. 61. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.