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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from Glaucus/The Wonders of the Shore by Charles Kingsley: Then Mr. Gosse's artificial sea-water will form a perfect
substitute. You may buy the requisite salts (for there are more
salts than "salt" in sea-water) from any chemist to whom Mr. Gosse
has entrusted his discovery, and, according to his directions, make
sea-water for yourself
One more hint before we part. If, after all, you are not going
down to the sea-side this year, and have no opportunities of
testing "the wonders of the shore," you may still study Natural
History in your own drawing-room, by looking a little into "the
wonders of the pond."
I am not jesting; a fresh-water aquarium, though by no means as
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