ABSTRACT
Before entering, in somewhat minute detail upon the examination of M. Caillié’s routes, I should make an observation to warn the reader against the apparent differences which he may observe between the journal of the travels and the map of the route. To render this journal fit for perusal, and not to interrupt perpetually the description of places and people, it has been found necessary to retrench the number of distances and bearings, to such an extent that any one who should attempt to form a plan of the route by the assistance of the narrative alone would fall into serious errors: respecting this circumstance however the reader has been already cautioned in a note in the first volume. The construction of the lines of route upon the map which I have designed is the result of all the indications given by the traveller, and which I have collected in the form of a table. It is also necessary to consult the following article, respecting the use which I have made of these materials, to render them accordant with anterior information and the positions already admitted as incontestable.
