There is a species of Grampus from two to three tons weight, and about sixteen feet in length, that amuses itself with jumping, or rather springing its ponderous body entirely out of the water, in a vertical position, and falling upon its back. This effort of so large a fish is almost incredible, and informs us how surprisingly great the power of muscle must be in this class of animal. A Correspondent writes to the "United Service Journal":--"I have seen them spring out of the water within ten yards of the ship's side, generally in the evening, after having swam all the former part of the day in the ship's wake, or on either quarter. When several of these fish take it into their heads to 'dance a hornpipe,' as the sailors term their gambols, at the distance of half a mile, they, especially at or just after sundown, may easily be mistaken for the sharp points of rocks sticking up out of the water, and the splashing and foam they make and produce have the appearance of the action of waves upon rocks. An officer of the navy informed me that, after sunset, when near the equator, he was not a little alarmed and surprised at the cry of 'rocks on the starboard bow!' Looking forward, he indistinctly saw objects which he and all on board took to be pinnacles of several rocks of a black and white colour. In a short time, however, he discovered this formidable danger to be nothing more than a company of dancing Grampuses with white bellies. As one disappeared, another rose; so that there were at least five or six constantly above the surface." Captain Owen relates that "the Bonita has the power of throwing itself out of the water to an almost incredible distance when in pursuit of its prey, the Flying Fish; and, the day previous to our arrival at Mozambique, one of these fish rose close under our bow, and passed under the vessel's side, and struck with such force against the poop, that, had any one received the blow, it must have been fatal. Stunned by the violence of the contact, it fell motionless at the helmsman's feet; but, soon recovering, its struggles were so furious that it became necessary to inflict several blows with an axe before it could be approached with safety. The greatest elevation it attained above the surface of water was eighteen feet, and the length of the leap, had no opposition occurred, would have exceeded 180." Of winged or Flying Fish we find this extravagant account in a philosophical romance, entitled, "Telliamed," by M. Maillet, an ingenious Frenchman, of the days of Louis XV.:--