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It must be remembered that the determination of small quantities of substances generally involves the use of reagents which are often contaminated, as an impurity, with the body sought for. Thus, in assaying silver, the oxide of lead or metallic lead used is rarely free from silver; and in the case of arsenic, the acids, zinc or ferric chloride are sure to contain arsenic. The same observation applies to the precipitation of lead by zinc, &c. The errors caused by these impurities are more marked in the determination of material having small quantities of metal than in that of ores which contain larger quantities. Errors of this kind are counteracted or neutralised by "blank" or "blind" determinations. These consist in carrying out by the side of and during the assay a duplicate experiment with the reagents only, which are thereby subjected to the same processes of solution, evaporation, filtration, &c. The final result thus obtained is deducted from that given by the assay, the difference gives the corrected result. In some cases, where it is desired or necessary to have a tangible residue or precipitate, some _pure_ inert material is added.

The casket was soon open before them, and the various jewels spread out, making a bright parterre on the table. It was no great collection, but a few of the ornaments were really of remarkable beauty, the finest that was obvious at first being a necklace of purple amethysts set in exquisite gold work, and a pearl cross with five brilliants in it. Dorothea immediately took up the necklace and fastened it round her sister's neck, where it fitted almost as closely as a bracelet; but the circle suited the Henrietta-Maria style of Celia's head and neck, and she could see that it did, in the pier-glass opposite.

Professor Max Muller admits that we share with the lower animals what he calls an emotional language, and continues that we may call their interjections and imitations language if we like, as we speak of the language of the eyes or the eloquence of mute nature, but he warns us against mistaking metaphor for fact. It is indeed mere metaphor to talk of the eloquence of mute nature, or the language of winds and waves. There is no intercommunion of mind with mind by means of a covenanted symbol; but it is only an apparent, not a real, metaphor to say that two pairs of eyes have spoken when they have signalled to one another something which they both understand. A schoolboy at home for the holidays wants another plate of pudding, and does not like to apply officially for more. He catches the servant's eye and looks at the pudding; the servant understands, takes his plate without a word, and gets him some. Is it metaphor to say that the boy asked the servant to do this, or is it not rather pedantry to insist on the letter of a bond and deny its spirit, by denying that language passed, on the ground that the symbols covenanted upon and assented to by both were uttered and received by eyes and not by mouth and ears? When the lady drank to the gentleman only with her eyes, and he pledged with his, was there no conversation because there was neither noun nor verb? Eyes are verbs, and glasses of wine are good nouns enough as between those who understand one another. Whether the ideas underlying them are expressed and conveyed by eyeage or by tonguage is a detail that matters nothing.

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