446 VARIOUS LETTERS by men of liberal sentiments, that it is somewhat more than a hearsay statement ; and what better foundation can there possibly be for the truth of any geological fact, than the concurrent testimony of the best-informed natives of the country described ?

With respect to precision being unfavourable to authenticity "j I consider this a new dogma ; and if I were disposed to confute it, (but it carries with it its own confutation,) I should point out many hearsay evidences, precisely recorded in my Account of JVlarocco, which have been confirmed already by Ali Bey (El Abassy) and many others ; but " non est hie locusJ*' J. G. Jackson.

Strictures respecting the Interior of Africa, a7id Confirmation of Jackson's Account of Sudan, annexed to his Account of the Empire of Marocco, Sfc, London, 16th Jan. 1818.

It is a satisfaction to perceive (after a lapse of eight or nine years since the publication of my account of Marocco and the interior of Africa), that in proportion as we are becoming better acquainted with the interior of that continent, my account becomes more authenticated, notwithstanding the attempts that have been so insidiously made to invalidate it.

•» Vide Appendix, No. II. to Park's Second Journey age lOS. 12