CHAPTER LXX

SHELLS

IN Uncle Paul’s room was a drawer full of shells of all sorts. One of

his friends had collected them in his travels. Pleasant hours could be

passed in looking at them. Their beautiful colors, their pleasing but

sometimes odd shapes, diverted the eye. Some were twisted like a spiral

stair-case, others widened out in large horns, still others opened and

closed like a snuff-box. Some were ornamented with radiating ribs,

knotty creases, or plates laid one on another like the slates of a roof;

some bristled with points, spines, or jagged scales. Here were some

smooth as eggs, sometimes white, sometimes spotted with red; others,

near the rose-tinted opening, had long points resembling wide-stretched

fingers. They came from all parts of the world. This came from the land

of the negroes, that from the Red Sea, others from China, India, Japan.

Truly, many pleasant hours could be passed in examining them one by one,

especially if Uncle Paul were to tell you about them.

One day Uncle Paul gave his nephews this pleasure: he spread before them

the riches of his drawer. Jules and Claire looked at them with

amazement; Emile was never tired of putting the large shells to his ear

and listening to the continual _hoo-hoo-hoo_ that escapes from their

depths and seems to repeat the murmur of the sea.

[Illustration: Cassis]

“This one with the red and lace-like opening comes from India. It is

called a helmet. Some are so large that two of them would be as much as

Emile could carry. In some islands they are so abundant that they are

used instead of stones and are burnt in kilns to make lime.”

“I would not burn them for lime,” said Jules, “if I found such beautiful

shells. See how red the opening is, how beautifully the edges are

pleated.”

“And then what a loud murmur it makes,” added Emile. “Is it true, Uncle,

that it is the noise of the sea echoed by the shell?”

[Illustration: Spiny Mollusk]

“I do not deny that it resembles a little the murmur of waves heard at a

distance; but you must not think that the shell keeps in its folds an

echo of the noise of the waves. It is simply the effect of the air going

and coming through the tortuous cavity.

“This other belongs to France. It is common on the shores of the

Mediterranean and belongs to the genus _cassis_.”

“It goes _hoo-hoo_, like the helmet,” Emile remarked.

“All those that are rather large and have a spiral cavity do the same.

“Here is another which, like the preceding, is found in the

Mediterranean. It is the spiny mollusk. The creature that inhabits it

produces a violet glair, from which the ancients derived, for their

costly stuffs, a magnificent color called purple.”

[Illustration: Paludinidæ]

“How are shells made?” asked Claire.

“Shells are the dwellings of creatures called mollusks, the same as the

spiral snail’s shell is the house of the horny little animal that eats

your young flowering plants.”

“Then the snail’s house is a shell, the same as the beautiful ones you

have shown us,” Jules observed.

“Yes, my child. It is in the sea that we find, in greatest number, the

largest and most beautiful shells. They are called sea-shells. To these

belong the helmet-shell, cassidula, and spiny mollusk. But fresh waters,

that is to say streams, rivers, ponds, lakes, have them too. The

smallest ditch in our country has shells of good shape but somber,

earthy in color. They are called fresh-water shells.”

“I have seen some in the water resembling large, pointed, spiral

snails,” said Jules. “They have a sort of cap to close the opening.”

“They are Paludinidæ.”

“I remember another ditch shell,” said Claire. “It is round, flat, and

as large as a ten or even twenty-sou piece.”

[Illustration: Planorbinæ]

“That is one of the Planorbinæ. Finally, there are shells that are

always found on land and for that reason are called land-shells. Such is

the spiral snail.”

“I have seen very pretty snails,” Jules remarked, “almost as pretty as

the shells in this drawer. In the woods you see yellow ones with several

black bands wound round them in regular order.”

“The creature we call the spiral snail—isn’t it a slug that finds an

empty shell and lives in it?” asked Emile.

“No, my friend; a slug remains always a slug without becoming a snail;

that is to say, it never has a shell. The snail, on the contrary, is

born with a tiny shell that grows little by little as the snail grows.

The empty shells you find in the country have had their inhabitants,

which are now dead and turned to dust, only their houses remaining.”

“A slug and a snail without its shell are very much alike.”

“Both are mollusks. There are mollusks that do not make shells, the slug

for example; others that do make them, such as the snails, the

Paludinidæ, and the cassididæ.”

“And of what does the snail make its house?”

“Of its own substance, my little friend; it sweats the materials for its

house.”

“I don’t understand.”

“Don’t you make your teeth, so white, shiny, and all in a row? From time

to time a new one pushes through, without your giving it any thought. It

does it by itself. These beautiful teeth are of very hard stone. Where

does that stone come from? From your own substance, it is clear. Our

gums sweat stone which fashions itself into teeth. So the snail’s house

is built. The little creature sweats the stone that shapes itself into a

graceful shell.”

“But to arrange stones one on another and make houses of them you need

masons. The snail’s house is made without masons.”

“When I say it is done by itself, I do not mean that the stone has the

faculty of making itself into a shell. You never see rubble piling

itself unaided into a wall. God, the Father of all things, willed that

the stone should arrange itself in a mother-of-pearl palace to serve as

a dwelling for the poor animal, brother to the slug, and it is

accomplished according to His will. In like manner He told the stone to

grow up into beautiful teeth from the depths of the rosy gums of little

boys and girls, and it is done as He willed.”

“I begin to feel rather friendly toward the snail, the voracious animal

that eats our flowers,” said Jules.

“I do not care to make you friendly with it. Let us make war on it since

it ravages our gardens; it is our right; but do not let us disdain to

learn from it, for it has many beautiful things to teach us. To-day I

will tell you of its eyes and nose.”

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The Story-book of Science · 第 70 / 80 章