Now, then, where's the first boy ?' 'Please, sir, he's cleaning the back-parlour window,' said the temporary head of the philosophical class.
'So he is, to be sure,' rejoined Squeers.

'We go upon the practical mode of teaching, Nickleby; the regular education system.

C-l-e-a-n, clean, verb active, to make bright, to scour.

W-i-n, win, d-e-r, der, winder, a casement.

When the boy knows this out of book, he goes and does it.