How did the two aunts respond when they saw the peach becoming bigger and bigger?

In Chapter Six, the aunts send James to get the peach because they want to eat it. When they notice it continues to grow, they begin shouting.

‘It’s growing!’ Aunt Spiker cried. ‘It’s getting bigger and bigger!’
‘What is?’
‘The peach, of course!’
‘You’re joking!’
‘Well, look for yourself!’
‘But my dear Spiker, that’s perfectly ridiculous. That’s impossible. That’s –that’s – that’s – Now, wait just a minute – No – No that can’t be right – No –
Yes – Great Scott! The thing really is growing!’
‘It’s nearly twice as big already!’ Aunt Spiker shouted.
‘It can’t be true!’
‘It is true!’
‘It must be a miracle!’
‘Watch it! Watch it!’
‘I am watching it!’
‘Great heavens alive!’ Aunt Spiker yelled. ‘I can actually see the thing bulging and swelling before my very eyes!’