The fish is entirely surrounded by water which exerts an equal pressure on all sides. When the fish moves its tail, or makes any movement at all, he moves in the water. Of course, by moving his tail from side to side he propels himself forward and by bending bis tail he goes in the direction in which it is bent.

Crowns.

1. Crown of England. 2. Russian Crown. 3. French Crown. 4. Austrian Crown. 5. Imperial Crown (Charlemagne's).