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Correspondence from Leonard D. Gale to John Torrey, dated 1853, discussing the drinking water analysis Torrey has recently been commissioned to perform for the city of Washington D.C. Gale offers the use of his lab in D.C. and "the water evaporated in my Sand bath" to aid in Torrey's analysis. He then goes on to describe the various specimens of oak he has observed in the D.C. area, including the Bartram's oak, or Quercus heterophylla.
Correspondence from John Leonard Riddell to John Torrey, dated 1833-1838, discussing plant specimens he is sending to Torrey, and the species he has encountered in Ohio and Louisiana. Obsolete plant names mentioned include Aspidium bulbiferum, Betula rubra, and Riddellia antiphylla.