Lewis Carroll's Alice's Adventures Under Ground - Pages 48 and 49

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This seemed to Alice a good opportunity for making her escape: she set off at once, and ran till the puppy's bark sounded quite faint in the distance, and till she was quite tired and out of breath.
"And yet what a dear little puppy it was!" said Alice, as she leant against
a buttercup to rest herself, and fanned herself with her hat, "I should have
liked teaching it tricks, if - if I'd only been the right size to do it!
Oh! I'd nearly forgotten that I've got to grow up again! Let me see: how is
it to be managed? I suppose I ought to eat or drink something or other, but
the great question is, what?"
The great question certainly was, what? Alice looked all round her at the flowers and the blades of grass, but could not see anything that looked like the right thing to eat under the circumstances. There was a large mushroom near her, about the same height as herself, and when she had looked under it, and on both sides of it, and behind it, it occurred to her to look and see what was on the top of it.
She stretched herself up on tiptoe, and peeped over the edge of the mushroom, and her eyes immediately met those of a large blue caterpillar, which was sitting with its arms folded, quietly smoking a long hookah, and taking not the least notice of her or of anything else.
For some time they looked at each other in silence: at last the caterpillar took the hookah out of its mouth, and languidly addressed her.
"Who are you?" said the caterpillar.
This was not an encouraging opening for a conversation: Alice replied rather shyly, "I - I hardly know, sir, just at present - at least I know who I was when I got up this morning, but I think I must have been changed several times since that."
"What do you mean by that?" said the caterpillar, "explain yourself!"
"I can't explain myself, I'm afraid, sir," said Alice, "because I'm not myself, you see."