take up an unfinished lecture

Her tongue was not less keen than her eye, and, whenever a damsel came within earshot, seemed to take up an unfinished lecture, as a barrel-organ takes up a tune, precisely at the point where it had left off.
The fact that it was churning day was another reason why it was inconvenient to have the whittaws, and why, consequently, Mrs. Poyser should scold Molly the housemaid with unusual severity. To all appearance Molly had got through her after-dinner work in an exemplary manner, had “cleaned herself” with great dispatch, and now came to ask, submissively, if she should sit down to her spinning till milking time. But this blameless conduct, according to Mrs. Poyser, shrouded a secret indulgence of unbecoming wishes, which she now dragged forth and held up to Molly’s view with cutting eloquence.
“Spinning, indeed! It isn’t spinning as you’d be at, I’ll be bound, and let you have your own way. I never knew your equals for gallowsness. To think of a gell o’ your age wanting to go and sit with half-a-dozen men! I’d ha’ been ashamed to let the words pass over my lips if I’d been you. And you, as have been here ever since last Michaelmas, and I hired you at Treddles’on stattits, without a bit o’ character — as I say, you might be grateful to be hired in that way to a respectable place; and you knew no more o’ what belongs to work when you come here than the mawkin i’ the field. As poor a two-fisted thing as ever I saw, you know you was. Who taught you to scrub a floor, I should like to know? Why, you’d leave the dirt in heaps i’ the corners — anybody ’ud think you’d never been brought up among Christians. And as for spinning, why, you’ve wasted as much as your wage i’ the flax you’ve spoiled learning to spin. And you’ve a right to feel that, and not to go about as gaping and as thoughtless as if you was beholding to nobody. Comb the wool for the whittaws, indeed! That’s what you’d like to be doing, is it? That’s the way with you — that’s the road you’d all like to go, headlongs to ruin. You’re never easy till you’ve got some sweetheart as is as big a fool as yourself: you think you’ll be finely off when you’re married, I daresay, and have got a three-legged stool to sit on, and never a blanket to cover you, and a bit o’ oat-cake for your dinner, as three children are a-snatching at. There’s no knowing what people WONNA like — such ways as I’ve heard of! I never had a gell come into my house as seemed to know what cleaning was; I think people live like pigs, for my part. And as to that Betty as was dairymaid at Trent’s before she come to me, she’d ha’ left the cheeses without turning from week’s end to week’s end, and the dairy thralls, I might ha’ wrote my name on ’em, when I come downstairs after my illness, as the doctor said it was inflammation — it was a mercy I got well of it. And to think o’ your knowing no better, Molly, and been here a-going i’ nine months, and not for want o’ talking to, neither — and what are you stanning there for, like a jack as is run down, instead o’ getting your wheel out? You’re a rare un for sitting down to your work a little while after it’s time to put by.