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.