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Said a man who is known as Lamarck, / Of giraffes eating leaves in a Park: / 'One thing is true / Of our friends in the zoo, / When the leaves are all gone they'll eat bark.'

Typed poem by a student of Hermann J. Muller with accompanying drawing by Elof Carlson in honor of Muller's 65th Birthday, 1955. Poems were contributed by Muller's graduate students (Elof Carlson, Seymour Abrahamson, Abraham P. Schalet, Irwin…