Joliet's facility for map-making in the field is evident from the fact that at this time he showed to the priests with La Salle a copy of the map that he had made of such parts of the upper lakes as he had visited, and gave them a copy of it. He moreover evidenced continued interest in religious matters by telling them that the Pottowattamies and other Indian tribes of that region were in serious need of spiritual succor. La Salle later, in November, 1680, repaid this frank tender of information of the little-known west by intimating his belief that Joliet never went but little south of the mouth of the Illinois, and is also stated to have declared that Joliet was an impostor. In his account of La Salle's last journey, Father Douay, referring to Joliet's discoveries as related by Marquette, says: "I have brought with me the printed book of this pretended discovery, and I remarked all along my route that there was not a word of truth in it." The efforts to deprive Joliet of the credit of the original discovery of the Mississippi falls before the despatch of Count Frontenac to Colbert, then Minister, dated Quebec, November 14, 1674: "VI. Sieur Joliet, whom Monsieur Talon advised me, on my arrival from France, to despatch for the discovery of the South Sea, has returned three months ago, and discovered some very fine country, and a navigation so easy through the beautiful rivers he has found, that a person can go from Lake Ontario and Fort Frontenac in a bark to the Gulf of Mexico, there being only one carrying-place, half a league in length, where Lake Ontario communicates with Lake Erie.... He has been within ten days of the Gulf of Mexico.... I send you by my secretary the map he has made of it.... He has lost all his minutes and journals in the shipwreck he suffered in sight of Montreal.... He left with the Fathers at Sault St. Marie copies of his journal." But to return to the circumstances under which Joliet made the voyage. Among other orders of Louis XIV. regarding Canada was a charge to discover the South Sea and Mississippi, and Jean Talon, Intendant of Canada, lost no chance of furthering this object. La Salle's journey of 1670 had failed to reach the great river, though he descended the Ohio to the falls at Louisville, and at his recall in 1672 Talon had the subject of further exploration in hand. Joliet had lately returned from his unsuccessful efforts to discover copper mines on Lake Superior, during which he had probably been the first white man to pass through the Straits of Detroit. Despite his late failure he had impressed Talon as the man best fitted to lead such an expedition, and so before sailing for France the Intendant recommended Joliet for the work to Count Frontenac, the new Governor.