An article of great curiosity is, The Ship-worm. - This worm has a very slender, smooth, cylindrical shell ; it inhabits the Indian seas, whence it was imported into Europe. It penetrates easily into the stoutest oak planks, and produces dreadful destruction to the ships, by the holes it makes in their sides: and it is to avoid the effects of this insect that vessels require sheathing.

The head of this creature is coated with a strong armour, and furnished with a mouth like that of the leech. A little above this it has two horns, which seem a kind of continuation of the shell; the neck is furnished with several strong muscles; the rest of the body is only covered by a very thin transparent skin, through which the motion of the intestines is plainly seen by the naked eye. This creature is wonderfully minute when newly excluded from the egg, but it grows to the length of four or six inches, and sometimes more. When the bottom of a vessel, or any piece of wood which is constantly under water, is inhabited by these worms, it is full of small holes; but no damage appears till the outer parts are cut away. Then their shelly habitations come into view, in which there is a large space for inclosing the animal, and surrounding it with water. There is an evident care in these creatures never to injure each other's habitations; by which means each case or shell is preserved entire. These worms will appear, on a very little consideration, to be most important beings in the great chain of creation, and pleasing demonstrations of the infinitely wise and gracious Power, which formed, and still preserves the whole, in such wonderful order and beauty; for if it were not for the rapacity of these and such animals, tropical rivers, and indeed the ocean itself, would be choked with the bodies of trees which are annually carried down by the rapid torrents, as many of them would last for ages, and probably be productive of evils, of which, happily, we cannot in the present state of things form any idea; whereas, being consumed by these animals, they are more easily broken in pieces by the waves; and the fragments which are not devoured become specifically lighter, and are consequently more readily and more effectually thrown on shore, where the sun, wind, insects, and various other instruments, speedily promote their entire dissolution.