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The Complete Herbal To which is now added, upwards of one...

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College.] Take of the juice of Quinces clarified twelve pounds, boil it half away, and add to the remainder, old white Wine five pounds, consume the third part over a gentle fire, taking away the scum (all you ought) let the rest settle, and strain it, and with three pounds of sugar boil it according to art.
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Culpeper.] Both are good for weak and indisposed stomachs.
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College.] Rob of sour Plums is made as Rob of Quinces, the use of sugar is indifferent in them both.
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Rob of English Currants is made in the same manner, let the juice be clarified.
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Culpeper.] The virtues are the same with Rob of Barberries.

Source attribution

The Complete Herbal To which is now added, upwards of one hundred additional herbs, with a display of their medicinal and occult qualities physically applied to the cure of all disorders incident to mankind: to which are now first annexed, the English physician enlarged, and key to Physic., Project Gutenberg eBook #49513

Rob Cydoniorum. Or Rob of Quinces. Rob Baccarum Sambuci. Or Rob of Elder Berries.