Rouffaer (right) june 1909 in Batavia, Hotel des Indes, with mining engeneer C. Moerman
Rouffaer wrote some articles, a book on batik (published in 1914) and left again for the Dutch colony, 1908-1911. This time, after again trips in Java, he concentrated on the southeastern islands, Floresw, Timor, fell ill again in Batavgia, but made a trip to the Philippines.
Frank Okker wrote a book on this important universal scholar who also was one of the initators of the Linschoten-vereniging, the Dutch equivalent of the Haklyut Society, a series of publications of the travels of the Dutch explorers, mostly in the VOC period.
Rouffaer was a universalist: wanted to know everything, collected biology, archaeology, linguistics, history. Both in his writings and in the biography by Frank Okker, he is more a collector than a writer, more enthusiast about all kind of material that could be found than someone who could build an image of the past. Also his enthusiasm for the social programme of Douwes Dekker, as well as his philosophy, is not elaborated in the book. So, he remains the great organising genius, without a product that can stand the time, besides the vitality of KITLV as a research centre.