It was reserved for the Frenchman Walcknaer to discover a curious discrepancy in Mungo Park's journal. This was a singular error upon the part of the traveller, which neither the English editor nor the French translator (whose work was badly performed) had discovered. Mungo Park in his diary records events as happening upon the 31st of April. As every one knows that that month has only thirty days, it followed that during the course of his journey the traveller had made a mistake of a whole day, reckoning in his calculations from the evening instead of the morning. Hence important rectifications were necessary in Arrowsmith's map; but none the less, when once Mungo Park's error is recognized, it is evident that to him we owe the first faithful map of Senegambia.
Although the facts that re
