On the 9th we saw a barque to leeward, manœuvring for whales, and evidently desirous, from her signals, of attracting our observation. On running down to her we found that she had a whale alongside, and that she was the John A. Robb, of Fair Haven, captain Baker, the same who was cast away in the barque Henry H. Crapo; her whale was a sulphur-bottom, and, as these are seldom captured, much curiosity was manifested to get a sight at him. The head was shaped like an inverted scoop; the fins and flukes resembled much those of the right whale. It has on its ridge a very small fin or hump, which serves to distinguish it from the fin-back; its jaws are furnished with black bone, but so short as to render it of little value as an article of commerce. In color its body is of a light grey, and is much longer, in proportion to its bulk, than any other fish I have seen. The blubber was about four inches thick, corrugated and arranged on the belly in great folds or rolls; it was literally covered by wounds made by the remora or sucking-fish. The whole length was eighty feet, and its yield fifty barrels--the oil commanding the same price as that of the right whale. It is seldom this variety of the whale is disturbed by the whaleman, its extreme shyness rendering it almost an impossibility to strike it. In this instance it was shot from the ship by a bomb-lance, which, by a great chance, caused a fatal wound, disabling the fish so that he was an easy capture. The high price of whalebone at home renders the ships on this ground, which have a large supply of it, anxious to get theirs to market ere there is a depression in price, and we being the only ship anticipating a speedy return, we are continually having it offered to us as freight. Amongst these ships is the Richard Mitchell, which narrowly escaped being driven ashore at Bunbury a few weeks ago. She had landed her captain to bargain for provisions, whilst the vessel was standing off and on, when a heavy southerly gale sprang up and stripped her of every inch of canvas. By great exertions they bent new sails, but it was not until after seventy-two hours beating that she was enabled to get an offing that secured her safety.