If the doctor knew he'd found out he could stand on his feet he'd likely write and tell Mester Craven.

Mester Colin's savin' th' secret to tell himself.
He's goin' to practise his Magic on his legs every day till his father comes back an' then he's goin' to march into his room an' show him he's as straight as other lads.

But him an' Miss Mary thinks it's best plan to do a bit o' groanin' an' frettin' now an' then to throw folk off th' scent." Mrs.Sowerby was laughing a low comfortable laugh long before he had finished his last sentence.
"Eh!" she said, "that pair's enjoyin' their-selves I'll warrant.
They'll get a good bit o' actin' out of it an' there's nothin' children likes as much as play actin'.

Let's hear what they do, Dickon lad." Dickon stopped weeding and sat up on his heels to tell her.

His eyes were twinkling with fun.
"Mester Colin is carried down to his chair every time he goes out," he explained.