1866. Am. Microscopical Society of the City of New York. Hon. Mem.
1866. Royal Botanical Society of Edinburgh. Hon. Fellow.
1867. National Academy of Sciences of the United States. Hon. Mem.
1867. Buffalo Historical Society. Corresp. Mem.
1868. Die Königliche Gesellschaft der Wissenschaften zu Göttingen. Corresp. Mem.
1868. Société Impériale Académique de Cherbourg. Corresp. Mem.
1871. Indianapolis Academy of Sciences. Hon. Mem.
1873. Minnesota Academy of Natural Sciences, Minneapolis. Hon. Mem.
1873. The Royal Society, London. Foreign Mem.
1875. Royal Irish Academy, Dublin. Hon. Mem.