The second visit, of some four years, gave him time to amass a large collection of insects, of which many were described in Insecta Transvaaliensia (1900–1911).
第2次採訪時（有4年些許），給予他足夠時間採集大量昆蟲標本，多數結稿成書如《Insecta Transvaaliensia》（1900–1911）。