Those fish, also, which are known by the name of sea-mice,2443 as well as the polypi2444 and the murænæ,2445 are in the habit of coming ashore—besides which, there is in the rivers of India2446 one kind that does this, and then leaps back again into the water—for they are found to pass over into standing waters and streams. Most fishes have an evident instinct, which teaches them where to spawn in safety; as in such places there are no enemies found to devour their young, while at the same time the waves are much less violent. It will be still more a matter of surprise, to find that they thus have an appreciation of cause and effect, and understand the regular recurrence of periods, when we reflect how few persons there are that know that the most favourable time for taking fish is while the sun is passing through the sign of Pisces.2447