Medicine: Envelopes v. Cans

An engineer last week predicted that paper envelopes of dried fruits and vegetables will in not many years replace canned foods in city kitchens. Machines have been perfected to bring this about, Charles Walter Thomas told a Manhattan assembly of mechanical engineers. The machines remove 90% or so of water from the foods (leaving them in a compact, dry condition), remove oxygen (which helps spoil foods), wrap and hermetically seal the dried products. When thus dehydrated, carrots or spinach are reduced to one-tenth of their volume weight, but when again watered cannot be...

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