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[Drawing of an irregular 4 sided object with a parallelogram inside]

[The following is written sideways under the drawing:]

              Sept. 1. 1862

Centerville-

 "Bisect the lines of 

any irregular 4 sided figure and the figure therein contained will be a parallelogram-"

    Prof Tatlock
               Williams Coll,

Through

         Lt. Wilson  
                a. a. a. s.
                  2nd. Brig.