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Sometimes it is necessary to draw up a table which will show, without calculation, the weight of substance equivalent to a given volume of gas or of solution. The substance used for standardising should be, whenever possible, a pure sample of the substance to be determined--that is, for copper assays pure copper should be used, for iron assays pure iron, and so on; but when this cannot be got an impure substance may be used, provided it contains a known percentage of the metal, and that the impurities present are not such as will interfere with the accuracy of the assay. Including compounds with these, the standard may be calculated by multiplying the standard got in the usual way, by the percentage of metal in the compound or impure substance, and dividing by 100. If, for example, the standard 1.008 gram was obtained by using a sample of iron containing 99.7 per cent. of metal, the corrected standard would be 1.008×99.7/100 = 1.005. In volumetric analysis the change brought about must be one in which the end of the reaction is rendered prominent either by a change of colour or by the presence or absence of a precipitate. If the end of the reaction or finishing-point is not of itself visible, then it must be rendered visible by the use of a third reagent called an indicator.

Mathilde Blind, in her "Study of Marie Bashkirtseff," says: "Marie loved to recall Balzac's questionable definition that the genius of observation is almost the whole of human genius. It was natural it should please her, since it was the most conspicuous of her many gifts. As we might expect, therefore, she was especially successful as a portrait painter, for she had a knack of catching her sitter's likeness with the bloom of nature yet fresh upon it. All her likenesses are singularly individual, and we realize their character at a glance. Look, for example, at her portrait of a Parisian swell, in irreproachable evening dress and white kid gloves, sucking his silver-headed cane, with a simper that shows all his white teeth; and then at the head and bust of a Spanish convict, painted from life at the prison in Granada. Compare that embodiment of fashionable vacuity with this face, whose brute-like eyes haunt you with their sadly stunted look. What observation is shown in the painting of those heavily bulging lips, which express weakness rather than wickedness of disposition--in those coarse hands engaged in the feminine occupation of knitting a blue and white stocking!"

Attempts were made by the early colonists to grow other crops which, for various reasons, did not thrive at Jamestown. Some plants, like bananas, pineapple, citrus fruits, and pomegranates, could not withstand the cold Virginia winters. Other plants, including rice, cotton, indigo, sugarcane, flax, hemp, and olives, did not grow vigorously for one reason or another, and repeated efforts to cultivate them usually resulted in failure. Mulberry trees grew well at Jamestown (the leaves were used to feed silk worms), but attempts to make silk were not successful commercially.

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