Mary Engle Pennington Tracks the Cold
Written by Studio AM.
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Mary Engle Pennington treated refrigeration as a continuous journey rather than a single cold room. Born in 1872, she studied chemistry and biology at the University of Pennsylvania. Women then received certificates rather than bachelor's degrees there, but she earned a doctorate in 1895. After running a clinical laboratory in Philadelphia, she joined the United States Department of Agriculture in 1905 as a bacteriological chemist.
Following the 1906 Pure Food and Drugs Act, Pennington became chief of the new Food Research Laboratory. Her team studied perishable foods and compared temperature conditions with bacterial growth and visible deterioration. Their work showed why foods needed steady cold, not cooling at isolated moments. Pennington followed the practical problem through storage, handling, transportation, and distribution. A well-cooled warehouse could not protect an egg that warmed elsewhere on its route.
The work joined laboratory evidence to ordinary equipment and routines. She examined containers and transport conditions and insisted that freshness claims be measured. Maintaining that continuity required engineers, drivers, warehouse workers, inspectors, and many others.
After leaving federal service in 1919, Pennington continued work on food preservation and later on frozen foods. Her work made each transfer part of the refrigeration problem: food needed suitable temperatures in transit as well as in storage. By making the gaps between facilities part of the scientific question, she helped turn refrigeration from a collection of cold places into a connected system.
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Questions
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Question 1 of 4
What is the main idea of the passage?
The answer is B: Mary Engle Pennington used scientific evidence to show that reliable refrigeration depends on continuous care across an entire food journey.
The biography follows Pennington from laboratory research to storage, transport, and distribution, emphasizing continuity across every transfer.
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Question 2 of 4
Why does the author describe refrigeration as a chain?
The answer is C: A warm stage anywhere along the route could undermine cooling at other stages.
The warehouse-and-egg example shows that success at one location is insufficient if the food warms during another part of its journey.
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Question 3 of 4
What does “perishable” mean as used in the passage?
The answer is D: Likely to spoil or deteriorate without suitable handling
The laboratory compared temperature with bacterial growth and deterioration in perishable foods, showing that such foods can spoil.
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Question 4 of 4
What position did Pennington take in 1905?
The answer is A: She joined the Department of Agriculture as a bacteriological chemist.
The first paragraph directly states that Pennington joined the Department of Agriculture in 1905 as a bacteriological chemist.
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