Agencies Affecting Foods.There are many agencies.biological,chemical and physical,which may affect foodstuffs,either by spoiling their appearance or rendering them unfit for consumption. Bacteria are most important among the biological factors,but yeasts and moulds.which may either aid or hinder presrvation.have to be considered:and then there are such animal pests as sugar and cheese mites.moths.rats and beetles,all of which may damage the raw material used in food manufacture ,or attack the finished products.
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