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IF a jam does not turn out well it is important to nkow why so that the jam-maker can confidently correct the error next time.
Most of the trial and error of grandmother's day has been eliminated by the knowledge now available.
Evans Scott, O.
"The art of making jams and jellies. Part 2,"
Journal of the Department of Agriculture, Western Australia, Series 4: Vol. 8
, Article 8.
Available at: https://researchlibrary.agric.wa.gov.au/journal_agriculture4/vol8/iss3/8