APPENDIX VIIL 
A FEW EEMARKS WITH REGARD TO THE MAPS. 
By Dr. A. Petermann. 
It was originally intended to compose a full memoir on the 
subject of the construction of the maps showing Dr. Earth's 
travels and researches ; but the preparation of the drawings 
themselves has, up to the last moment, occupied so much time 
that, in order not still further to delay the publication of these 
volumes, an apology only for a memoir can be offered. Be- 
sides, all the native information and the itineraries, which form 
the substance of so considerable a portion of the tv^^o general 
maps, have been given at full length in the Appendices to 
the five volumes. It was also felt that, better than all the 
most elaborate disquisitions and discussions that could be ad- 
vanced in such a memoir, will be the test applied to the maps 
by the Niger Expeditions, which for a period of five years 
are to proceed both up the Kvvara and the Benuwe by means 
of steamboats, commanded by experienced naval officers, who 
will set at rest the true positions of such of Dr. Earth's 
points as they may be able to reach. The first expedition 
which was sent out to follow up Dr. Earth's discoveries, 
namely the expedition up the Benuwe in 1854, commanded 
by Dr. Baikie, did not, it is true, reach the point where 
Dr. Earth crossed that river in 1851 *; but a second expe- 
* The information Dr. Earth was able to collect with reference to the 
lower part of the Benuwe, as far as subsequently surveyed by Dr. Baikie, 
was rather meagre ; yet even with regard to those few data, provisionally 
as they were laid down from Dr. Earth's original map in A. Petermann's 
" Account of the progress of the Expedition to Central Africa, London, 
1854," Dr. Baikie acknowledges the service that map proved to him, 
and records his testimony both as to the amount and general correctness 
of the information it contains. (See Dr. Baikie's " Narrative of an Ex- 
ploring Voyage in 1 854," p. 446.) 
