THE WONDERS OF THE SHORE. 205 
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 beautiful as a salt-water one, is even 
more easily established. A glass jar, floored with 
two or three inches of pond-mud (which should be 
covered with fine gravel to prevent the mud washing 
up); a specimen of each of two water-plants which 
you may buy now at any good shop in Covent 
Garden, Vallisneria spiralis (which is said to give to 
the Canvas-backed duck of America. its peculiar 
richness of flavour), and Anacharis alsinastrum, that 
