'
CHALK.
PART 2.
[Illustration: 'Fizz and bubble, bubble and fizz.']
eve'-ning
brought
vin'-e-gar
bub'-ble
air
stirred
poured
grains
hun'-dreds
smiled
crowds
threads
catch
died
dropped
mixed
1. The children had much to say that evening about Joe and the field.
They had brought home a lump of chalk.
2. 'I will show you something,' said father, and he got a cup of
vinegar, crushed a little of the chalk, and dropped it into the cup.
Fizz and bubble, bubble and fizz!
3. What was going on?
When the stir came to an end, the chalk was not there!
'Part of it has gone off in gas,' their father said. 'The rest is lime,
and it is mixed with the vinegar.'
4. 'We did not see any gas,' said Harry.
'You can't see gas. It is like air. All those bubbles were made by the
gas. It went out of the cup into the air.
'Now, get a cup of water. Come along! Where is your chalk?'
5. Father rubbed some of it into the water, and stirred it up. The water
now looked like milk.
Father poured it into the sink, and showed Harry and Dora, at the bottom
of the cup, a great many tiny grains.
6. 'Those little round things,' he said, 'are shells.
Pages:
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32