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When the acid is saturated, the slips are to be removed; or, if filings be employed, the solution is to be poured off from what remains undissolved; small bars are then put in, which will precipitate the copper from the saturated acid, in a powder of the peculiar appearance and colour of copper, and the liquid being poured from the powder, this is to be washed clean of the crystals by repeated levigations.
At our feet, a smooth, globular object, of the size of a crab-apple, is lying half-buried in the sand. Taking it in your hand, you find it to be a univalve shell, the inhabitant of which is concealed behind a closely-fitting door, resembling a flake of undissolved glue. It is a Natica. Place it gently in this pool and watch for a few moments.
Oxidation has effected it but slightly, and lime and other soluble plant foods remain undissolved even at the grass roots. Swamps and peat bogs are abundant on its undrained surface, and to this drift sheet belong the lake lands of our northern states and of the Laurentian peneplain of Canada. The lake basins of the Wisconsin drift are of several different classes.
Any remaining undissolved can be filtered off on a counterpoised filter paper, and heated in a water oven until absolutely dry. It is, however, unnecessary to do this when two samples only are compared against each other, nor is it essential to know the actual weight of albumen employed, provided it be the same in each experiment.
Andy scraped his plate thoughtfully with his knife, looked into his coffee-cup, stirred the dregs absently and dipped out half a spoonful of undissolved sugar, which he swallowed meditatively. He tossed plate, cup and spoon toward the dishpan, sent knife and fork after them and got out his smoking material.
IV. If, instead of caustic soda as in III., a solution of oxide of copper in ammonia be used, cotton and silk are dissolved, but wool remains unchanged, i.e. undissolved. If sugar or gum solutions be added to the solutions of cotton and silk, the cotton cellulose is precipitated, whilst the silk is not, but remains in solution.
Put copperas in a pail of water, in such quantity that some may constantly remain undissolved at the bottom. This makes a saturated solution. To every privy or water-closet, allow one pint of the solution for every four persons when cholera is about. To keep privies from being offensive, pour one pint into each seat, night and morning.
The preglacial subsoils were residual clays and sands, composed of the insoluble elements of the country rock of the locality, with some minglings of its soluble parts still undissolved. The glacial subsoils are made of rocks of many kinds, still undecayed and largely ground to powder.
Thus treated rosin spirit furnishes about one-fourth of its volume of a colorless mobile liquid, which after long-continued fractional distillation is resolved into a variety of fractions boiling at temperatures from 95 deg. to over 180 deg.. Each of the fractions was treated with concentrated sulphuric acid, and the undissolved portions were then re-fractionated.
The story is not without its difficulties, since Lord Percy had been contracted, several years previously, to a daughter of the Earl of Shrewsbury, whom he afterwards married, and by the law he could not have formed a second engagement so long as the first was undissolved.
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