6. 'Now, you found that out, and I found the five yellow leaves. It is
my turn again. I can see yellow threads standing up in a ring all round
the middle of the cup, and their tops are thick.'

7. 'It is my turn now! In the very middle there is a green heap. It
looks as if the yellow threads were taking care of it.'

'Oh, the heap is all made up of little round things! Look, I can pull it
to pieces.'

[Illustration: Butter-cup.]

8. 'So can I,' said Harry; 'here is one, here is another! They are not
round after all, do you see? Each is round at the bottom, but has a
little bent horn at the top.'

9. 'They must be seeds. I will break one open. Oh no! Just look, there
is a little ball inside. Have you found a ball in yours?'

'Yes, there is a ball in every one. It must be a seed, or a little egg.'

10. 'Birds have eggs,' said Dora, 'plants have seeds.'

'Well, it is all the same thing,' said Harry.

'I think the green thing with a horn is only a case to take care of the
seed.'

11. 'All these things seem to take care of each other. First, the green
leaves at the back take care of the yellow cup.'