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The stain is obviously lead sulphide; but what else do you see?" "I see some particles of metal a white metal apparently and a number of fragments of woody fibre and starch granules, but I don't recognize the starch. It is not wheat-starch, nor rice, nor potato. Do you make out what it is?" Thorndyke chuckled. "Experientia does it," said he.
Place it on a sieve, and, while working it with one hand, pour a steady stream of water over it with another. Shortly you will find a grayish, tough, elastic lump before you, while in the pan below, when the water is carefully poured off, will be pure wheat-starch, the water itself containing all the sugar, dextrine or gum, and mineral matter.
The white powder washed away is nearly pure wheat-starch. Of course the other ingredients, such as the mineral matter and the like, might be referred to, but the starch at least should be shown.
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