A Curiosity

I knew a little boy, not very long ago,
Who was as bright and happy as any boy you know.
He had an only fault, and you will all agree
That from a fault like this a boy himself might free.
  
"I wonder who is there, oh, see! now, why is this?"
And "Oh, where are they going?" and "Tell me what it is?"
Ah! "which" and "why" and "who," and "what" and "where" and "when,"
We often wished that never need we hear those words again.
  
He seldom stopped to think; he almost always knew
The answer to the questions that around the world he threw.
To children seeking knowledge a quick reply we give,
But answering what he asked was pouring water through a sieve.
Yet you'll admit his fate was as sad as it was strange.
Our eyes we hardly trusted, who slowly saw him change.
More curious grew his head, stemlike his limbs, and hark!
He was at last a mere interrogation-mark!