Clean sand, clean stones, water drawn at high tide and carefully decanted, three small plants of Ulva Latissima, with one clump of Corallina Officinalis, made up the contents of the tank, when, on the tenth of August, it was the third time filled.  A sheet of yellow paper was placed between the tank and the window, and it was left three days at rest.  At the end of that time, the water, which was beautifully clear when introduced, had grown a little hazy, and, as the sunbeams fell aslant it, the unaided eye could perceive a multitude of minute whitish creatures darting forward and backward like a swarm of bees.  Then five Actinias were laid upon the rocks, to which they at once adhered, spreading out their restless tentacles in busy seizure of the tiny prey.  In a week more the foggy appearance had ceased; but the clearness of the water was marred by the slimy exudations from the Actinias.  Knowing that this matter was eaten by some of the Crustacea, five or six small Soldier-Crabs were dropped in, which faithfully performed their allotted labor.  From this time, animals were added daily, until they had reached to thirty in number.  On the fifteenth of September, a fine specimen of brown Chondrus Crispus was added, and on the thirtieth, a very large frond of Ulva Latissima.  A great portion of the Chondrus decayed at its junction with the shell on which it grew, and fell off; but the Ulva increased much in size, as well as in depth of color and firmness of texture.

And now months have gone by, and at last my Aquarium is successful.  Fifty lively denizens now sport in the crystalline water and come at the daily roll-call.  Come with me and I will introduce them to you.  A fig for scientific nomenclature! you shall know them by their household names.

This Bernhard Crab in the front, so leisurely pushing away the sand before him with his broad, flat claws, quietly enjoys the meal he finds, undisturbed by fears of a failing supply.  There is less of enterprise than complacency in his character, and I call him Micawber, for he is always expecting “something to turn up.”  Twice since March has he changed his coat, and thrown off his tight boots and gloves for new ones.  The disrobing seemed to give him little trouble, though he sat dozing at the door of his cell some hours after, as though fatigued by the unusual effort.  Very becoming is the new costume; and the red coat is prettily relieved by the gray tint of his Diogenes-like dwelling.

There goes a military cousin of his, striding along, with his heavy armor clattering against the glass as he walks.  A pugnacious fellow is that same soldier; and if he meet an opponent, you may see the tug of war.  Should he chance to prefer the other’s shield to his own, he will seize him in his burly arms, and shake him from under its protection.  Yet he is cautious withal; for though obliged to doff his own armor before he can try that of his denuded foe, he retains hold of both until satisfied with the trial.  If he like the new mail, he will march off with it; if not, he will array himself in his own again.  Meanwhile the vanquished combatant waits tremblingly the result of the examination, glad to get possession of the rejected defence, be it which it may.