s the window; and the tank, both top
and sides, wrapped in folds of paper. A week of darkness changed the
deep green to a dingy olive. But the experiment could not be continued.
The nightly admission of air by lifting the paper covering was
insufficient to maintain the imprisoned creatures. They were happy,
though captive, while in a mimic ocean, but miserable in a dark dungeon.
Languid and spiritless, they lay supine, or crawled listlessly and
aimlessly about. This would not do, and so light was again admitted
freely to all but one side of the tank; there, a screen of yellow paper
intercepted the direct rays of the sun, while upon the top they fell
through the foliage of a Clematis vine.

Three weeks more wrought a slight change for the better; but it was too
slight and too slow for my patience, or that of curious friends waiting
to see my Aquarium.

The second experiment had failed, and so once more the tank was emptied.
Two or three animals only had died; all the others gave evidence of
health. Again they were removed to other vessels, and again I began
anew.

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