His father's connections made him welcome in Berlin and Vienna, where he became correspondent for several French journals, including
Le Soleil,
La France,
Le Gaulois and
Le Petit Marseillais. In 1890 ''
L'Illustration'' asked him to accompany and report on the expedition led by
Henri Brosselard-Faidherbe to explore Guinea and the sources of the
Niger River. The expedition established the route of a railway line from the
Mellacorée River to
Kankan, and defined the border between the new colony of
French Guinea and the British colony of
Sierra Leone. Dubois's report appeared in ''L'Illustration
in 1892. He then undertook a journey to Palestine for Le Figaro, which he described in an article on Nöel en Bethléem
(Christmas in Bethlehem). In 1894 he published Le péril anarchiste'' (The Anarchist Peril), a work that was not entirely serious. French forces led by
Joseph Joffre entered
Timbuktu on 12 February 1894. ''L'illustration'' sent two senior reporters, Dubois and
Jules Huret. Dubois reached
Dakar in October 1894, and traveled by railway, then by steam boat, by land, and by boat on the Niger to
Kabara, the port for Timbuktu. On the way, he met
Ernest Noirot, the administrator of the
Sine-Saloum circle in Senegal. He admired Noirot's approach to administering Sine-Saloum, and particularly his schools, providing elementary French education, introducing new crops (maize, vegetables and European berries), introducing the students and their parents to the use of the plow. Dubois described Noirot as a modest secular missionary. Dubois thought that the
Fula people of Senegal had been driven from
Adrar, to the north, by the Moors, who had in turn been driven from Spain. Further east, Dubois found the
Songhai people near
Djenné quite different ethnically from others in the region. They told him they had originally come from the east, and Dubois decided from his research that they might have come from
Yemen. Dubois found similarities between the houses in Djenné and the tombs of Ancient Egypt, and visual similarities between the Songhai and
Nubian people, and speculated that the town could also have originally been an Upper Egyptian colony. On the other hand, he wrote of these people: Dubois spent several weeks in Timbuktu making notes and taking photographs. These formed the basis for his 1897 book
Tombouctou la Mystérieuse (Timbuctoo: the mysterious). He admitted that Timbuktu lacked impressive buildings, but put this down to lack of suitable materials. He went on, "Unable, therefore, to develop the sensuous arts, Timbuctoo reserved all her strength for the intellectual, and here her dominion was supreme." He described a "University of Sankore" in Timbuktu. Talking of an earlier period in the history of the town, he says, In 1897 Dubois was recruited by the French colonial authorities to accompany a military expedition under Captain
Marius Gabriel Cazemajou to reach Chad before the British. In his race against time Cazamajou drove the porters ruthlessly and shot those who tried to escape. Dubois fell out with Cazamajou over these methods and left the expedition at
Say. A few weeks later Cazamajou was killed at
Zinder. Dubois travelled home via
Dahomey, reaching France in 1898. ==Entrepreneur==