Word: substrata
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Dates: during 1940-1949
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Danger & Nerves. Hopp & Linder made a substrata survey of fields where there was no protective covering, discovered that all earthworm life was snuffed out in a single freezing spell. But in a burlap-covered acre, 995,000 worms survived; 1,610,000 slithered to safety beneath a protective acre of hay. The conservationists recommend a covering of chopped cornstalks or manure, or a quick-growing catch crop, to blanket the worms and tide them through the winter...