joint,--the same articulation which gives the human hip its marvellous liberty of action. Between them are five rows of minute holes, and, in life, a transparent, hair-like foot is protruded from each, at the pleasure of the owner. When disposed to change its situation, it stretches forth those on the side towards which it would go, fixes them by means of the sucker at the tip of each, and, simultaneously withdrawing those in the rear, pulls itself along.
The mouth, placed in the centre of the base, is very large in proportion to the size of the animal. It is formed of five shelly, wedge-shaped pieces, each ending in a hard, triangular tooth. The whole mouth is a conical box, called by naturalists "Aristotle's lantern."
The shell is hardly thicker than that of a hen's egg, and is even more fragile. When the spines are rubbed off, the brioche-like shape is modified, and in place of the depression in the middle of the upper side there is seen a slight prominence.
Mine was a very inoffensive creature. He occupied the same corner for many weeks, and changed his place only when a different arrangement of stones was made. He then wandered to a remote part of the tank and chose a new abode. Both retreats were on the shady side of a stone overhung with plants. There for months he quietly kept house, only going up and down his hand-breadth of room once or twice a day. Minding his own business without hurt to his neighbor, he dwelt in unambitious tranquillity. Had he not fallen a victim to the most cruel maltreatment, he might still adorn his humble station.
As he was sitting one evening at the door of his house, bending about his lithe arms in the way he was wont, two itinerant Sticklebacks chanced to pass that way. They paused, and, not seeing the necessity for organs of which they had never known the use, they at once decided on their removal.
In vain did the poor Hedgehog oppose them. With all the pertinacity of ignorance, they maintained their certainty of his abnormal condition; and with all the officiousness of quackery, they insisted upon immediate amputation. Aided by two volunteer assistants, the self-made surgeons cut off limb after limb before their reckless butchery could be stopped.
At last I effected their dismissal. But their pitiable patient was too far reduced for recovery. His exhausted system never rallied from the shock, and he survived but a few days.
Alas! alas! that so exemplary a member of the community should have perished through piscine empiricism!
How many things you have collected! Your well-filled basket attests your industry and zeal, and suggests the fruitful question of the novelist, "What will you do with it?" Will you throw its contents on the sand, and go away satisfied with these imperfect glimpses of sea-life? Will you take them home indeed, but consign them to a crowded bowl, to die like the prisoners in the Black Hole of Calcutta? Or will you give to each a roomy basin with water, and plants to keep it pure?
This were well; and you could thus study their structure at leisure, but not their habits. To know the character of an individual, you must watch him among his fellows; you must observe his bearing to the small; you must see how he demeans himself in presence of the great. To do this, the surroundings must be such that none shall be conscious of restraint, but that every one, with homely ease, may act out his own peculiar nature. In short, you must make ready for them another Atlantic, in all things but breadth like its grand prototype.
Nor is this a difficult undertaking. By following the advice of some experienced person, you may avoid all those failures which are apt to attend the experiments of a tyro. I will direct you to our pioneer in aquarian science, Mr. Charles E. Hammett. He can furnish you with all you want, give you most efficient aid, and add thereto a great amount of practical in
