4. 'That is a bit of lead,' said their father. 'Which do you think is the next in weight?'
'This red one. It is a good deal lighter, though!'
'That is called copper. Now, what comes next?'
5. They were not sure, but thought that iron came next, and then tin, and then zinc. Their father told them these names as they went on. He told them also that all these things were metals, and had been dug out of the earth.
6. 'Suppose we make a box to keep them in?'
'Oh yes!' cried both.
'And if we find any more things like these, we will put them in.
7. 'Would you put in a buttercup?'
'No, no!'
'Or a grain of wheat?'