The Jumna's length is 360 feet between per pendiculars ; extreme, 370 feet 5h inches ; 49 feet beam ; depth moulded, 41 fuofc 11 inches; registered tonnage 4173 25 94. by displacement upwards of 6000 tons. Her engines will be of 7 00 horse-power, nominal. The hull is divided into 26 compartments ; each one is water tight, so that should any accident occur to one portion of the vessel no risk will be incuried to the whole. Tho whole of the interior of tho ship, save those poitions necessarily set apait for machinery and the working tackle, has been designed and ananged for the accomo ■dation of army officers, troops, passengers, seamen, &c. Each suite of compartments is separate and independent of each other, yet each is comprehended in one plan of ventilation, so fiom one end of the huge ship to the other, and from the lower deck to the poop, a constant supply of fresh air is obtained. To provide sleeping accommodation for tho troops and seamen, tho roofs of the various decks are so arranged that hammocks cau bo slung fiom them. The poop and forecastle will be con nected by three bi idges, one on each side of the vessel, and the usual bridge above the centre of tho upper deck. The steering apparatus and capstans will be of a very strong and complete description. The launch of this noble vessel, notwithstanding the unfavorable state of tho weather, was witnessed by a great concourse of spectators. Shipwiecks —Captain D Welsh, of the ship Lady O^tavi.1, which left Sydney for this port on the 28th July hist, and arrived here yesterday, furnishes us with the following statement in leferenco to two disasters at sea :— Passed thvough Torres Straits, and cleared Booby Island on their w< stern side in twelve days from Sydney, and had no occasion to anchor. There were two vessela sunk, with their tops level with the water. The first was a full-rigged ship, of about 00O tons, fiom the np pearanco of her masts. They wei e all intact, and large portions of her sails still hanging to the yards. Thero were seveial laigo canoes about the ship, and as we approached we fired several muskets over their heads, a~id drove them away. Passed close to this ship, but no Europeans were to be seen. 