The months flew by through autumn, winter and spring. Roger established a stud farm in the Happy Valley where he could locate a captured dozen of zebra and interbreed with Maska donkeys ... perhaps a manageable, large-bodied zebra-mule might solve some of their transport difficulties in the regions of the tse-tse fly. He introduced shorthorn cattle from South Africa to mingle with the native oxen and improve the milk supply. He imported from Natal six Basuto ponies, two stallions and four mares. He ordered three safety bicycles—the great new invention or combination of inventions. He and his German engineers, reinforced by a clever Swiss sent out by the German directorate, gave special consideration to the waterfalls of Iraku, to harness them to turbines and produce electric light. This power would feed electric dynamos when the progress of the railway construction enabled such heavy things to reach the Happy Valley. They laid out great coffee plantations and experimented in tea and quinine. It was hoped the natives might take up all these cultures in time, on their own account, as they had done that of cacao on the Gold Coast and in the German Cameroons. The day for his departure in the early spring came ever nearer and nearer. The two Australians arrived, went down with fever, recovered and eventually proved the right stuff, especially young Philip Ewart. Mrs. Stott said she would see he did not get into mischief while the Director was absent in England. She would also give an eye to the Brenthams’ house and the doings of Andrade and Halima as caretakers. There was therefore little cause for anxiety on Roger’s part as he made his preparations for a six-months’ absence, save the rumoured doings of a certain Stolzenberg, a mysterious German hunter who, coming from the British Sphere, had established himself near the north-west escarpment of Lake Manyara, apparently on the border of the Happy Valley Concession (Glücklichesthals Konzession). *CHAPTER XIX* *TROUBLE WITH STOLZENBERG*