HOLLAND.
Koninklijke Natuurkundige Vereeniging in Nederlandsch-Indie (Batavia). Corresponding Member, 1880. Societe Hollandaise des Sciences a Harlem. Foreign Member, 1877. Zeeuwsch Genootschap der Wetenschappen te Middelburg. Foreign Member, 1877.
ITALY.
Societa Geografica Italiana (Florence). 1870. Societa Italiana di Antropologia e di Etnologia (Florence). Hon. Member, 1872. Societa dei Naturalisti in Modena. Hon. Member, 1875. Academia de' Lincei di Roma. Foreign Member, 1875. La Scuola Italica, Academia Pitagorica, Reale ed Imp. Societa (Rome). "Presidente Onoraria degli Anziani Pitagorici," 1880. Royal Academy of Turin. 1873. "Bressa" Prize, 1879.
PORTUGAL.
Sociedade de Geographia de Lisboa (Lisbon). Corresponding Member, 1877.
RUSSIA.
Society of Naturalists of the Imperial Kazan University. Hon. Member, 1875. Societas Caesarea Naturae Curiosorum (Moscow). Hon. Member, 1870. Imperial Academy of Sciences (St. Petersburg). Corresponding Member, 1867.
SPAIN.
Institucion Libre de Ensenanza (Madrid). Hon. Professor, 1877.