Yusuf, refusing to do some translation which I requested him, now forfeits all claims to my service. I told him, to-day, to go off to Kanou. Afterwards I arranged with him to go with me to Zinder, where, before the governor, I hope to get clear of him; for he is now of little use, and costs me more than all my servants together. Mohammed Tunisee has done him great harm; but, nevertheless, this chap continues to improve since the arrangement made, by which he becomes only the servant of Barth. The Germans, however, are still afraid of him. Yusuf is trying the same system with me, but will probably find that it will end in no good affair for himself. Mohammed Tunisee and Yusuf seem hitherto to have combined to spoil all our people. The liberated slaves from Tunis, brought up by me, have turned out the best and most faithful servants. I am much pleased with this. All the people of Damerghou are afflicted with ophthalmia, which is said to arise from the winds that prevail constantly over this open and unsheltered country. Some of the people pretend it is caused by drinking ghaseb-water, which appears absurd enough. The Moorish and other merchants attribute the greater part of their diseases to drinking water,--especially the fevers. How much truth there is in this assertion is not easy to be determined. _11th._--It has been agreed that I and my colleagues should here part for a time, Dr. Barth going to Kanou, and Dr. Overweg to Tesaoua and Maradee, whilst I proceed with En-Noor direct to Zinder. Dr. Barth promises to be in Kuka in two months; and Dr. Overweg says he will immediately correspond, that is from Tesaoua to Zinder. The latter has the more difficult journey before him; but even Dr. Barth's visit to Kanou may turn out a more serious business than perhaps he anticipates. We took leave one of the other with some emotion; for in Central Africa, those travellers who part and take divergent routes can scarcely count on all meeting together again.