An expedition more successful in its results, has been undertaken in Dahomey on the Guinea coast, the particulars of which are given in the Journal of the Royal Geographical Society of London, (vol. 16.) This journey was performed by Mr. John Duncan, from Cape Coast to Whyddah, and from the latter about five hundred miles due north, through the Dahomey country to Adofoodiah. Although the king of Ashantee had refused permission for Mr. Duncan to pass through his territory, and had endeavored to prejudice the king of Dahomey against him, he was received with great kindness by the latter, and every facility given him to travel in his dominions. A guard of one hundred men was furnished to accompany him--a path was cleared for upwards of one hundred miles, and arrangements made so that at every village through which he passed, provisions were always waiting, ready cooked for them. Among the strange things seen by this traveller was a review of six thousand Female troops, well armed and accoutred. Their appearance, for an uncivilized nation, was surprising, and their performance still more so. The slave trade is carried on extensively in Dahomey. In the market of Adofoodiah, articles from the Mediterranean, and from Bornou in the interior were exposed for sale, showing the immense extent of the trade of the country. He met people from Timbuctoo and gathered some particulars of that remarkable city, as well as some information respecting Mungo Park's death. This enterprising traveller has lately been provided with the means to enable him to set out on a new journey with a determination to penetrate the country to Timbuctoo, from whence he will endeavour to follow the Niger to its mouth.