<h3>OUR OWN AQUARIUM</h3>
<p>It is quite a long time since the Imp and the Elf first started a
guest-house for the water people. One day, when the Elf was very
small, and I was showing her pictures in a book, and telling her
about the sticklebacks, and the minnows, and the loaches, and the
caddisworms, and all the rest of them, she sat silent for a long
time, and then said suddenly, "I want to ask him," and wriggled
down from my knee and went off to find the Imp. Presently they
came back together. "We want to have some caddises for our own,"
they said, and I understood that the Elf had thought it only fair
to consult the Imp before asking me about them for herself.</p>
<p>That very day we began to plan the guest-house. At first it was
to be no more than a jam pot, with mud in the bottom of it for
the caddises. Then we thought that perhaps even a caddis would
like a house a little bigger than a jam pot, or even than a big
marmalade jar. Even caddises crawl. The next bigger thing to one
of the big marmalade jars that they have in the nursery is a
basin. And basins are no use at all. They tip over if you lean on
their edges to look at anything that is crawling about inside.
There was nothing for it but to plan something new. And, if we
were to have something made on purpose, if we were to have a
really big home for caddises, there was no reason why we should
not plan it bigger still and be able to keep minnows in it, or
goldfish, or even a smallish eel.</p>
<p>So we spent a splendid afternoon planning the guest-house, and
next morning walked over the fields to the village with a lot of
scribblings in our hands. The scribbles were to explain what sort
of a guest-house we wanted. We walked straight through the
village to the glazier's shop. A glazier is a man who comes and
mends windows when tennis-balls have gone through them and broken
them. This glazier was very nice and kind. He let the Elf and the
Imp climb up and sit on his table, while he looked over our
scribbles, and then took a big sheet of paper and made a neat
drawing himself. He made what he called a plan, and what he
called an elevation, and then he drew a real picture of what the
guest-house was to be, and put a curly fish with a winking eye
swimming about in the middle. This picture he gave to the
children, so that they could think about the guest-house while it
was being made. He promised that we should have it in a week's
time.</p>
<p>It was a fortnight before it came. That is the way of glaziers
who are leisurely but very clever. For though the guest-house was
so long in coming, it was splendid when it came. It had four
sides made of glass, with wooden pillars at the corners, painted
green. It was like a house whose windows had spread all over the
walls. And it was so big that the Imp could easily stand in it
with both feet, a good way apart, too. We filled it with water
and it did not leak. There was a tube hidden in the bottom of it
with a tap at the side, so that we could let the water out and
put fresh water in without having to take out the fish. That was
important, as we did not want to disturb our guests, and all the
water-folk want their water changing from time to time.</p>
<p>We found a fine place for the Aquarium on one of the broad
bookshelves in the study, and as soon as we had fixed it there we
set about furnishing it and filling it with guests. We covered
the bottom with sand, and put some big stones in it with holes in
them to make hiding-places for the fish. Then we set off for the
duck-pond with three jam pots and two small nets. We did not
bother to play with the geese that day or even to look at the
donkey. We went straight to the edge of the pond and began
pulling some of the green duckweed out on the banks. We put a
good deal of it into one of the pots, and then searched through
a lot more, looking for those little round flat snails that I
told about in the second chapter. We wanted plenty of them,
because they keep the aquarium healthy, and the water sweet and
fresh. As soon as we had plenty of duckweed and plenty of snails,
we went on over the fields to the beck. And here we got
half-a-dozen caddisworms and a water-shrimp, and some minnows. We
let the shrimp go, because he does not live well except in
running water. But the others we carried home with us in the jam
pots, which we had to pretend into triumphal carriages. For we
were bringing home our first guests.</p>
<p>The Imp and the Elf sat on high chairs in the study till bed-time
watching the caddises crawl about on the mud, and the minnows
flit in and out among the stones. And before they went to bed
they said goodnight, very solemnly, to the water people. For it
is always best to be polite, even if the water-people do not
understand. And, as the Elf said, "Perhaps they do."</p>
<p>Next morning the carrier stopped on his way from the station with
a big can that had come by train from London; and in the dark
depths of the can we could see golden flashes. For I had written
to town for half-a-dozen golden fish to come and stay with the
minnows.</p>
<p>And after that the guest-house was always full. From time to time
new guests came, and others went away, let loose again in the
duck pond or the stream. Always the guests are changing. Someone
sent us a little water-tortoise for a present, and we kept him
with us for a little while, and then put him in the pond to see
life on his own account. We have had little eels from the stream,
and sticklebacks (but these are quarrelsome folk), and tadpoles,
and loaches, and carp, who are like greenish goldfish, and
long-bodied gudgeon, and silvery roach. Every morning, after
breakfast, before setting out walking, the children come into the
study and feed the guests with worms, and ants' eggs, and
crumbled vermicelli.</p>
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<p>The guest-house is like a little water world where we can see the
smaller water-folk living in their own way. It is a beautiful
little world, with its clear water, and green weed, with the
little fishes swimming under the roots of the weeds, and darting
among the crevices of the stones. And it is a little world that
is not very difficult to manage. We have to be careful not to
overfeed the guests, and yet we must be sure that they have
enough to eat. We have to keep the water clear, changing it every
other day, pouring fresh water in at the top and running out the
old through the tap at the bottom. It is a little world that
anyone can manage who loves the water-folk well enough to take
plenty of trouble with them.</p>
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<p>And now, do you know, we have come to the end. There is such a
lot to write about the things that are jolly and wet that the Imp
and the Elf say I have missed out half the things that ought to
be put in, and I know that I have missed out a very great deal
more than that. But if you really care for the water-folk you
will find out the best of all the things that cannot be written
here by going to the stream side, or the pond side, or the side
of the lake and making friends with the water-people for
yourself.</p>
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