It was fortunate that Park's health had hitherto been very slightly affected, since the whole burden of the expedition evidently rested upon him. He not only directed all the great movements of the caravan, but superintended its minutest details, and was foremost on all occasions requiring physical strength and great personal exertions. In these arduous services both of body and mind, Mr. Anderson and his other associates, who might have been expected to share in his labours, were incapable of rendering him any useful assistance; and by their continued ill health, contributed in no small degree to the anxiety and embarrassments attending the expedition. Being thus arrived at the Niger, he embarked upon that river on the 21st of August, and the following day reached Marraboo; from whence he shortly afterwards dispatched Isaaco to Sego, the capital of Bambarra, to negociate with Mansong the sovereign, for a free passage through his dominions and for such other facilities as might enable him to prosecute his journey into the interior. He remained at Marraboo, waiting Isaaco's return; and in the mean time was seized with the dysentery, which had been fatal to so many of his followers; but saved himself by a bold and vigorous course of medicine, which, aided by the great strength of his constitution, restored him to health very speedily. After much negociation and many difficulties with Mansong's ministers, he was at first permitted to go to Samee in the neighbourhood of Sego, and afterwards to Sansanding; in order to build a vessel and make preparations for his voyage down the Niger. In this negociation, which is fully detailed in the Journal, Park appears to much advantage. His speech to Mansong's messengers, explaining the purpose and objects of his expedition into Africa, is distinguished by great propriety and good sense; and affords a very favourable specimen of his talents for such transactions. [Footnote: Journal, p. 151.]