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| oz. | dr. | gr. | |
| An English pint of spring water weighs about | 15 | 3 | 12 |
| A strong soap-ley, the English pint, weighs about | 17 | 6 | 24 |
| The difference between the two is, | 2 | 3 | 12 |
—and supposed to be the quantity of fixed alkaline salt contained in one pint of such ley. A most accurate and easy method for ascertaining the strength of soap-leys for immediate use, is as follows, viz.
Take a small bottle, and having filled it with water, put it into one scale, and as many small lead-shot into the other will exactly balance it. Suppose 12S is requisite for that purpose. Suppose, again, that the bottle and water just weighs 4 ounces; this is throwing it into 128 parts; half of that is 64128, or 2 ounces; half it again,
