This image is an example of a crossed letter. A crossed letter is one in which the writer first writes across the page in one direction, then rotates the page (usually 90 degrees) to continue the letter. This was done to save on postage and conserve paper, both of which were relatively expensive back in the day.
We haven’t transcribed this document yet — we’ve been saving these more difficult items for later!
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Letter, To: “Mama” (Ellen Ewing Sherman) From: Ellie, March 14, 1878.