When I looked into Tank No. 5, however, there were several swimming-crabs and sea-scorpions to be seen.  The sea-scorpions are fish, but bold-faced, fiery, greedy little fellows.  The swimming-crabs are said to be “the largest, strongest, and hungriest” of English crabs.  What a thought for those they live on!  Let us picture to ourselves the largest, strongest, and hungriest of cannibals!  Doubtless he would make short work even of the American Giant, as the swimming-crabs, by night, devour other crabs, larger but milder-tempered than themselves.  It speaks volumes for the sea-scorpions, who are small fish, that they can hold their own in the same pool with the swimming-crabs.

Tank 4 contains big spider-crabs, who sit with their knees above their heads, winking at you with their eyes and feelers; or scramble out unexpectedly from dens and caves here and there, high up in the rocky sides of the pool.

Nos. 6, 7, and 8 contain fish.

It really is sad to think how completely our ideas on the subject of cod spring from the kitchen and the fish-kettle. (As to our cod-liver oil, we know no more how much of it has anything to do with cod-fish than we can guess where our milk and port-wine come from.) Poor cod!  If of a certain social standing, it’s odds if we will recognize any of him but his head and shoulders.  I have seen him served up in country inns with a pickled walnut in the socket of each eye; and in life, and at home, he has the attentive, inquisitive, watchful, humorous eyes common to all fishes.

Fishes remind me rather of Chinese, who are also a cold-blooded race:  slow, watchful, inquisitive, acquisitive, and full of the sense of humour.  There are fishes in the Great Aquarium whose faces twinkle again with quiet fun.

The cod here seemed quite as much interested in looking at us through a glass window as we were in looking at them.  They are tame, and have very large appetites—­so tame, and so hungry, that the fish who live with them are at a disadvantage at meal-times, and it is feared that they must be removed.

These other fish are plaice, soles, brill, turbot, and skate.  The skate love to lie buried over head and ears in the sand.  The faintest outline of tail or a flapping fin betrays the spot, and you long for an umbrella-poke from some Zoological-Garden-frequenting old lady, to stir the lazy creature up; but it is impossible.

Suddenly, when you are as tired of waiting as Jack was when Coomara was “engaged thinking,” the fin movement becomes more distinct, a cloud of sand rises into the water, and a grey-coated skate, with two ornamental knobs upon his tail, flaps slowly away across the pool.

Sometimes these flat-fish flap upwards to the surface, poke their noses into the other world, and then, like larks, having gone up with effort, let themselves easily down again to the ground.

As we were looking into No. 7, an ambitious little sole took into his head to climb up the rocks, in the caves of which dwell crusty crabs.  By marvellously agile doubles of his flat little body, he scrambled a good way up.  Then he fell, and two or three valiant efforts still proving vain, he gave it up.