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Scientific American, Vol. 83, No. 2 (July 14, 1900) (1900)

leaf 8

An illustration from Scientific American, Vol. 83, No. 2 (July 14, 1900), 1900, leaf 8
or necessary to keep them dry from hour to hour and and in two years the fields were covered with colza. shellac may be given if it is to be much exposed. This day to day for ever afterward. A ‘polder” is any The total cost of the work was about $4,000,000. process is said to succeed very well… … ‘“ Retvizan.”

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