He surveyed over , collected and brought back with him 5000 plants, 1000 birds and 3000 insect species, as well as 70 reptiles and the skins of 130 different mammals.
V naslednjih letih je izvedel še štiri potovanja po Srednji Aziji:1870-1873 je od Kyakhta prečkal puščavo Gobi do Pekinga, nato pa raziskoval zgornji Jangce (Chang Jiang) in leta 1872 prebegnil v Tibet.