The Nemesis took her departure from Mozambique on the evening of the 1st of September, but did not reach Johanna until the afternoon of the 4th, having made nearly the whole distance under sail only, against a very strong south-westerly current. The island of Mohilla is, of course, the first seen, and strikes you by its lofty, wooded summit, and the numerous small islets which surround it to the southward. The Channel between Mohilla and Johanna is picturesque, and the high inland mountains every where present a rich and refreshing appearance, being covered with luxuriant wood, and broken occasionally into deep glens, marked by the usual rich tropical verdure. Johanna is the most frequented of all the islands, and affords the best anchorage. But it was quite dark before the Nemesis approached the bay, and an occasional blue light and a rocket were let off, to give notice of her approach, in order that a pilot might come off, or else a signal be made to direct her to the best anchorage. A large fire was soon lighted on shore for this purpose; and, no sooner did she come within a moderate distance, than numerous boats came alongside; the natives jumped on board, in apparent delight at seeing her come in, not unmixed with extreme surprise at her appearance, and the mode in which she moved through the water. Several of them spoke broken English, and although they were naturally delighted at the prospect of earning a little money, they were even more so at the sight of her armament, and at once concluded that she was sent purposely to assist the sultan and the people of the island, who were at that time in great danger and trouble. Johanna is occasionally frequented by English ships, for provisions, which are there abundant and reasonable, and the people have become favourably known in England, in consequence of their kind treatment of numerous poor English seamen, who have from time to time been wrecked on those islands, or on the neighbouring coasts. The great bay, which is on the northern side of the island, is not, however, a very suitable anchorage, except, perhaps, during the S.W. monsoon. At all times, there is a very heavy surf rolling in shore; and, during the N.E. monsoon, which sets directly into it, the heavy swell renders the anchorage unsafe. It cannot, therefore, be considered at all eligible as a coal depôt for steamers, particularly when Mozambique, which has greater claims to attention, is within such a moderate distance. Still, it is a very useful place of refuge for our whaling ships in that part of the world; and, as the inhabitants, as well as the authorities, have always shewn great kindness to the English, and, in fact, consider themselves almost in the light of allies of England, it would seem politic to keep alive the good feeling they evince toward us.