1831. College of Medicine and Surgery, Fairfield, N. Y. M. D. 1844. Harvard College. M. A. 1860. Hamilton College, Clinton, N. Y. LL. D. 1875. Harvard University. LL. D. 1884. McGill College, Montreal, Canada. LL. D. 1887. University of Michigan. LL. D. 1887. Cambridge University, England. D. S. 1887. University of Oxford, England. D. C. L. 1887. University of Edinburgh, Scotland. LL. D. D. SOCIETIES OF WHICH DR. GRAY WAS A MEMBER. 1835. Cæsarea Leopoldino-Carolinæ Academiæ Naturæ Curiosorum Vratislaviensis, Breslau. Mem. 1836. Die Königliche Botanische Gesellschaft in Regensburg. Mem. 1836. Academy of Natural Sciences of Philadelphia. Corresp. Mem. 1837. Boston Society of Natural History. Corresp. Mem. and Hon. Mem. 1841. American Academy of Arts and Sciences. Fellow. 1846. Acad. Literarum et Scientiarum Regia Boica, Munich. Hon. and Corresp. Mem. 1847. Massachusetts Hort. Society. Corresp. Mem. 1847. Essex Co. Massachusetts Natural Hist. Soc. Corresp. Mem. 1848. Regia Scientiarum Societas, Upsal. Mem. 1848. Am. Philosophical Society, Philadelphia. Mem. 1849. Die Pollichia, Ein Naturwissenchaftliche Verein der Bayerischen Pfalz. Mem. 1849. Senkenbergische Naturforschende Gesellschaft zu Frankfort-am-Main. Mem. 1850. Linnæan Soc. of London. Foreign Mem. 1850. Société de Physique et d’Histoire Naturelle de Genève. Hon. Mem. 1851. Vereeniging voor de Flora van Nederland. Corresp. Mem. 1852. British Assoc. for the Advancement of Science. Corresp. Mem. 1852. Lyceum of Natural History, New York. Hon. Mem. 1852. Der Naturwissenschaftliche Verein in Hamburg. Hon. Mem. 1853. Philadelphia College of Pharmacy. Hon. Mem. 1853. Polk Co. Agricultural Society, Iowa. Mem. 1854. Kaiserlich Königliche Geologische Reichsanstalt, Vienna. Corresp. Mem. 1854. Société Impériale des Sciences Naturelles de Cherbourg. Corresp. Mem. 1855. Regia Scientiarum Academia Borussica. Corresp. Mem. 1857. California Academy of Natural Sciences. Hon. Mem. 1857. Société de Botanique de Leyden. Corresp. Mem. 1858. Dublin University Zoological and Botanical Association. Corresp. Mem. 1858. Historical Society of Tennessee. Hon. Mem. 1859. Regia Scientiarum Academia Sverica, Stockholm. Foreign Mem. 1859. Imperial Society of Botany, Moscow. Mem. 1859. Russian Society of Horticulture, St. Petersburg. Mem. 1860. Cleaveland Natural History Soc. of Bowdoin College (Maine). Hon. Mem. 1861. Botanical Society of Canada. Hon. Mem. 1862. Imperial Academy of Sciences, St. Petersburg. Corresp. Mem. 1863. Natural History Society of Dublin (union with Dublin University Nat. Sci. Association). Corresp. Mem. 1863. National Academy of Sciences of the United States. Mem.