Drop by drop

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References in classic literature ?
An opiate vapour, dewy, dim, Exhales from out her golden rim, And, softly dripping, drop by drop, Upon the quiet mountain top.
Instead of using it, they had kept it for me, and, while they were being suffocated, they gave me life, drop by drop. I wanted to push back the thing; they held my hands, and for some moments I breathed freely.
Pearls fell drop by drop, as subterranean waters filter in their caves.
To destroy our malefactors piece-meal, drying up in their veins, drop by drop, the blood we are too chicken-hearted to shed by a single blow which would at once put a period to their sufferings, is deemed to be infinitely preferable to the old-fashioned punishment of gibbeting--much less annoying to the victim, and more in accordance with the refined spirit of the age; and yet how feeble is all language to describe the horrors we inflict upon these wretches, whom we mason up in the cells of our prisons, and condemn to perpetual solitude in the very heart of our population.
They used to show to visitors the implements of torture wherewith the Three were wont to worm secrets out of the accused--villainous machines for crushing thumbs; the stocks where a prisoner sat immovable while water fell drop by drop upon his head till the torture was more than humanity could bear; and a devilish contrivance of steel, which inclosed a prisoner's head like a shell, and crushed it slowly by means of a screw.
He tore the golden brooches that upheld Her queenly robes, upraised them high and smote Full on his eye-balls, uttering words like these: "No more shall ye behold such sights of woe, Deeds I have suffered and myself have wrought; Henceforward quenched in darkness shall ye see Those ye should ne'er have seen; now blind to those Whom, when I saw, I vainly yearned to know." Such was the burden of his moan, whereto, Not once but oft, he struck with his hand uplift His eyes, and at each stroke the ensanguined orbs Bedewed his beard, not oozing drop by drop, But one black gory downpour, thick as hail.
A thousand times would I have shed my own blood, drop by drop, to have saved their lives; but I could not, my father, indeed I could not sacrifice the whole human race."
"They might have extracted the blood from my heart, drop by drop!"
Besides, I wish such persons to observe that the grand artery and the arterial vein are of much harder and firmer texture than the venous artery and the hollow vein; and that the two last expand before entering the heart, and there form, as it were, two pouches denominated the auricles of the heart, which are composed of a substance similar to that of the heart itself; and that there is always more warmth in the heart than in any other part of the body- and finally, that this heat is capable of causing any drop of blood that passes into the cavities rapidly to expand and dilate, just as all liquors do when allowed to fall drop by drop into a highly heated vessel.
"Mort Dieu!" cried the bowman, "there is a bucketful or more of my blood over in France, but it was all spilled in hot fight, and I should think twice before I drew it drop by drop as these friars are doing.
Would to heaven that the shedding of mine own blood, drop by drop, could redeem the captivity of Judah!
Gondy remained firm, and the abuse of the day seemed to glide over his head as the sarcasms of the evening before had done; but hatred and revenge were accumulating in his heart silently and drop by drop. He looked coldly at the queen, who nudged Mazarin to make him say something in his turn.