Dutch Society of Sciences (Haarlem), For. Memb. 1877.
Koninklyke Natuurkundige Vereenigung in Nederlandisch-Indie (Batavia),
Corr. Memb. 1880.
Royal Academy of Sciences (Amsterdam), For. Memb. 1892.
ITALY:
Societa Italiana di Antropologia e di Etnologia, Hon. Memb. 1872.
Academia de' Lincei di Roma, For. Memb. (supplementary), 1878,
ordinary, 1883.
Reale Academia Valdarnense del Poggio (Florence), Corr. Memb. 1883.
Societa dei Naturalisti in Modena, Hon. Memb. 1886.
Societa Italiana delle Scienze (Naples), For. Memb. 1892.
Academia Scientiarum Instituti Bononiensis (Bologna), Corr. Memb. 1893.
PORTUGAL:
Academia Real das Sciencias de Lisboa, For. Corr. Memb. 1874.
RUSSIA:
Imperial Academy of Sciences (St. Petersburg), Corr. Memb. 1865.
Societas Caesarea Naturae Cuniosorum (Moscow), Ordinary Member, 1870,
Hon. Memb. 1887.
SWEDEN:
Societas Medicorum Svecana, Ordinary Memb. 1866.