Between 1892 and 1894 he explored the territory in the vicinity of Mount Kenya with George Galvin and Ludwig von Höhnel, a lieutenant in the Austro-Hungarian Navy. Departing from Mkunumbi on September 18, 1892 they proceeded inland from the coast, mapping the Guasso Nyiro River, the Lorian Swamp, the Tana River, Lake Rudolph and then Lake Stefanie. They were the first westerners to come into contact with the Bantu Tigania and Igembe Meru in this region (Carl Peters had passed to the south in 1889). On January 30, 1893 they were attacked by some 200 warriors of the Wamsara (a subgroup of the Meru), who retreated after killing three porters.