The Sun. — 1821-09-17 (London, England)

SLAVE TRADE.  The Tartar, lately arrived at Portsmouth) left Sierra Ilone.on the 17th of June, and proceeded to Batbad'oes, Martinique, Jamaica, a.m.]. Havannah. We have considerable pleasure in stating thegeneral improved state of the Colony' of Sierra Leone as to healthfulness, which had not suffered this season from the usual periodical rains, though they had commenced rather earlier than usual. Trade was also improving there, and much advantage was .to result to the Settlement, as well as to the one on the river Gambia, from the renewal of the Gum Trade with the Moors of the Great Desert. The ships co4posing the squadron had _all left the river of Siirkra Leone, to avoid the rains, before the Tartar sailed. The Pheasant, Captain l(r,r.v, was to Leeward, but was to return to Sierra Leone, to await the arrival of the newly-appointed Commodore. The Myrmidon, Capt. LEEKE, was to refit at Ascension, during the rains, in the Bight of Biafra. The Thistle, Lieut. HAGAN, was sent to the Banana Islands, a newlyacquired cluster, near the shoals of St. Ann ; the Snapper, LieatenantiEvANs, was gotre,to the. almost newly-discovered Island of St. Fernando Po, in the Bight of Biafra—which station promises to be one of great importance to our cruisers. The Morgiana, Captain FINLAISON, which had been missing several months, had arrived at Rio Janeiro, with a slave trader. The Tartar, during her present stay on the Coast; captured four Slave ships, with about 1000 slaves ; three of which had been condemned previous to her sailing. The Slave, ' trade was carrying on in full activity under Neutral flags, principally the French, and with all the usual attendant horrid circumstances of  _ . inhumanity, oppressioil, and cruel deaths. —The country is Satisfied that all that it was possible for humanity, zeal, and superior intelligence to effect, under the existing National Treaties, with a view to the suppression or mitigation of this horrid trade, has been done during the three years of Sir GEORGE CowEa's. command : and it is a consolation to the friends of humanity that he is to be succeeded by an officer of kindred talent and qualifications—Sir RODERT MENDS ; but it is only insult. and mockery in the Uovernments of France, Spain and Portugal,  to pretend to' assure us that they have, a sincere desire to .abolish this trade in human blood, whilst their subjects are•permitted to'pursue the. course they do. Verified_ accounts have been received of the melancholy fate of the officer and Bi itish crew, in charge of the.slave brig Volcano do Sol; which was captured two years since by one of the -cruizers under Sir G. COLLIER'S orders. The Morgiana, on arriving with a slave veSselal"Bahla,.on the coast of Brazil, received a . confirmation": of the former report, of the murder of - the. master's mate, and the whole of the. British.searnen, -Which was perpetrated in. cold blood, off -the-port of St. Salvador; and as soon as the .slaves were landed the Vessel %vas' sunk.- It. appears that one of tire. crew was a native African, who having been einplOyed as a supernumerary on,.board the King's ships, when on the African station, was put on board the prize, and" being a man of athletic form, he, appeared too tempting an object, to share the fate of his European- messruates, on account of the high price which -he .bOre as.a slave. Was,. therefore, not murdered with the rest of the crew,-lint sold as one of the slave cargo, and sent intoAhe.interior, whence, in the course of traffic, he became transferred to other masters, and at  length he met with one. of the Ofticers:.of the Morgiana, who he recognized as having belonged to the Tartar, and to him he related the circumstances of this horrid transaction. Captain