这封信是达尔文为感谢美国地质学家费迪南德·范德维耶·海登博士而写的。

The letter was written by Darwin to thank an American geologist, Dr. Ferdinand Vandeveer Hayden.

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所以，布肯南就给格里尔写了封信，他告诉格里尔，在德瑞德·斯科特案件中做出强有力的裁决也许有助于给国家带来和平。

So Buchanan wrote to Grier. He told him that a strong decision in the Dred Scott case might do much to bring peace to the country.

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