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Close to this and serving as a contrast, the Captain placed the green laver he had made Nell pick up at the last moment when they were leaving Seaview and running to catch the steamer. "This chap, styled the `ulva latissima' by the scientific gentlemen who manufacture such titles, is a capital thermometer," said the Captain on putting in the laver.
In a glass jar of moderate size was placed a piece of Ulva latissima, or Sea-Lettuce, a broad-leaved, green, aquatic plant, and a small fish. The mouth was closed by a ground glass stopper. The jar was exposed to the light daily; the water was never changed; nor was the glass stopper removed, excepting to feed the fish, once or twice a week, with small fragments of meat.
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.
Of all marine plants, the Ulva latissima, or Sea-Lettuce, is first and best. It has broad, light-green fronds, and is hardy and a rapid grower, and hence a good giver of oxygen. Next to this in looks and usefulness comes the Enteromorpha compressa, a delicate, grass-like Alga. After a while the Chondrus crispus, or common Carrageen Moss, may be chosen and added.
I got sand and covered the bottom; I found two jagged stones and leaned them against each other on the sand; I gathered fronds of ulva latissima; I persuaded a boatman to bring me a bucket of salt-water from beyond the line of breakers, and I poured it carefully into the jar.
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.
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