498 



APPENDIX. 



night and day, the voyage is to be accomplished in three 

 days. Now the native craft used upon these dangerous 

 plateau- waters never dare to cross them : the voyager 

 may rush over the narrow parts of the Tanganyika Lake, 

 but of course he would not attempt the physical impossi- 

 bility of navigating without chart or compass beyond sight 

 of land. It is impossible to believe in a canoe-cruise of 6 

 days across the lake : it is evident that a coasting-cruise 

 is meant. The total of hours, allowing the day to be 12, 

 and without halts, would be 72. Upon the Tanganyika 

 I estimated the rate at a little more than 2 knots an hour. 

 Thus, in round numbers, we have 145 miles, which pro- 

 bably require reduction : an estimate of the mean amount 

 of error distributed on the whole of Mr Wakefield's 

 ' Routes ' gives, according to the annotator, an exagger- 

 ation of 1.24 : 1.0 ; and of course, when estimating the 

 length of these distant and dangerous navigations, exag- 

 geration would be excessive. "Wc may, therefore, fairly 

 assume the semi-circumference of the Ukara Lake at 120 

 miles, and the total circumference at 240. Sadi, we are 

 told (p. 309), made Bahari-ni on the Eastern shore the 

 terminus of his long journey from Tanga Bandar to the 

 'Lake Nyanza' (Xyanja?). Let us protract the full 145 

 miles as the exceptional rate of 3 knots an hour upon 

 Captain Speke's last map, without allowing anything for 

 the sinuosities of the coast, and the end would strike 

 the entrance of ' Jordan Nullah ' off' the ' Bengal Archi- 

 pelago/ about half the width of the so-called ' Victoria 

 Nyanza.' 



As regards the breadth of the Ukara Lake, we read 

 (p. 310), 'Standing on the Eastern shore, Sadi said he 

 could descry nothing of land in a western direction, except 



