At ten, A.M., we parted company with the Tamahamah, and sailed for the Marqueses Islands. The turtle with which our deck was covered, were very troublesome and offensive for about a week, when they became quite domesticated and gave us not the slightest inconvenience. For two or three weeks we served them to the crew constantly, in lieu of the usual allowance of salt provisions. It was a most valuable substitute, and important to us, as we were bound upon a long cruise, as well for the health of the crew as for the preservation of our sea stock. When the number became comparatively small, we discontinued the general use of them, and served them only once or twice a week. We never fed them, and for aught I could see, they were equally as fat and healthy a month after they were taken on board, as on the first day. As a sea stock nothing can be more convenient or better calculated for a long cruise. They may be put any where and kept in almost any way, and if it should be thought advisable to feed them, there is scarcely any vegetable substance that they will not eat after they are a little domesticated. The liver of this turtle is particularly delicious. When fried, it is not unlike a fine oyster, and although partaken very freely of, no ill effect is ever experienced from it. Sixteen days after leaving Charles Island, we made the island Rooahooga, one of the southernmost of the Marqueses group. The wind was fresh and blew steadily from the southward and eastward, accompanied by a heavy swell. As we approached the islands, we had some rainy and cloudy weather, but with this exception, our whole passage was attended with clear days and fine moonlight nights. In latitude three degrees south, and longitude ninety-five degrees west, we observed a remarkable appearance in the water, which, had we been navigating an unfrequented ocean, would have very much alarmed us. At several different times during the day, on September 12th, we passed through violent rips, and at times nearly the whole ocean assumed the appearance and agitation of boiling water. Throughout our passage, we remarked, that whenever the wind hauled to the southward of southeast, it increased in force. It occurred so frequently as to be a subject of general remark.