In 1831, Denmark once more made an attempt to colonize, by means of a missionary enterprise, the group formerly known as New Denmark, and occasionally as Frederick Islands. Pastor Rosen landed in August of that year on the island of Kamorta, and first set up his establishment on the so-called Frederick Hill, then on the adjoining Mongkata Hill; somewhat later on the island of Trinkut, and lastly on the shore immediately beneath the Mongkata Hill. In December, 1834, after about a four years' stay, Pastor Rosen left the islands, and in 1839 published, at Copenhagen, his own experiences and personal observations, under the title: "_Erindringen om mit Ophold paa de Nikobariske Oerne_" (Recollections of my Residence on the Nicobar Islands). In 1835, the Roman Catholic Bishop of the Straits of Malacca dispatched to Kar-Nicobar two French missionaries, the Fathers Chopard and Borie. But after a certain lapse of time, during which their missionary efforts gave promise of the most pleasing results, and when they had lived about a year on the island, the pious work fell through, owing to the credulity and prejudices of the natives, to whom the two missionaries were represented by the crew of a ship from the adjacent shores of the continent as English spies, whose object probably was to ascertain the products of the country, which thereupon would speedily be annexed by the English Government. The missionaries had to flee, and Borie expired in the arms of his companion before he could get off the island. Chopard afterwards, in the year 1849, published his adventures in this group of islands in the "Asiatic Journal of the Indian Archipelago," under the title, "_A few Particulars respecting the Nicobar Islands._" In March, 1845, Mr. Mackey, Danish Consul in Calcutta, set on foot a small expedition to the Nicobar Archipelago. That gentleman hoped to find amongst the southern islands strata of coal, and made a voyage thither in prosecution of that object, on board the schooner _Espiègle_, commanded by an Englishman named Lewis, and accompanied by two Danes, Mr. Busch, the sole commander of the expedition, and a certain Mr. Lowert. By the end of May the adventurers were once more in Calcutta. With the exception of a few lumps they had not found coal-beds on any part of the island, while they lacked the physical strength requisite for founding the agricultural colony, which it had been intended to set on foot at the same time. The scientific results of this voyage are comprised in a small _brochure_, "H. Busch's Journal of a Cruise amongst the Nicobar Islands," (Calcutta, 1845).