Most fishes have only a rapid flight to depend upon for their safety; some, however, more favoured by nature, have been provided with peculiar defensive weapons. Thus the dorsal fins of the Dragon-weever (_Trachinus draco_), a small silvery fish, frequently occurring on our shores, are armed with strong spines, that effectually provide against its being easily swallowed by a more powerful enemy. The wounds it inflicts are very troublesome and painful, though it does not appear that the spines contain any poisonous matter, as the fishermen generally believe. At all events, the dragon-weever is not nearly so dangerous as the _Clip bagre_, a kind of silurus or sly, inhabiting the Brazilian rivers, that inflicts with its long spines such painful wounds as to deprive the sufferer of consciousness, and to produce an inflammation that lasts for several weeks. The Lance-tails, or Acanthuri, have a sharp bony process, not unlike the very large thorn of a rose-tree, placed on each side of the tail; by this they can inflict a deep cut on the hand of any one who is so imprudent as to seize them in that part. [Illustration: Surgeon Fish. (Acanthurus.)] I could still add a long list of spine-armed fishes, but content myself with noticing the Stickleback, which frequently owes its preservation to the sharp needles with which it is provided. [Illustration: Diodon.] The Tetrodons and Diodons have the power of inflating their body at pleasure, and thus raising the small spines dispersed over their sides and abdomen in such a manner, as to operate as a defence against their enemies. These beautiful and remarkable fishes chiefly inhabit the tropical waters, but sometimes wander into higher latitudes. Man is not the only creature driven by the currents of fate far from the place of his birth.