WEST PAN SAND BUOY. ONE OF THE MANY BUOYS AT THE MOUTH OF THE THAMES.
In the sea the Jelly-fish looks like an umbrella of bluish-white jelly, from which hang tassels and threads. Look over the side of a boat, or from the pier, and you often see them drifting by, hundreds of them, like so many ghosts.
Each one is moving along, with its edges partly opening and shutting. It is plain that this waving motion causes the creatures to move through the water. Also, they can rise to the surface, or fall to the depths, and do not collide with one another. So the Jelly-fish is not at all helpless.
At night Jelly-fishes sometimes look very beautiful. Each one shines in the water, with a soft yet strong light, like fairy lamps afloat in the sea.
They are of all sizes. Some you could put in a small wineglass, others measure nearly two feet across. Evidently the Jelly-fish grows, and, in order to live and grow, it must eat; but what does it eat, and how does it obtain its food?
