John M Barry demonstrates great fascination with the dynamic and complex mechanics behind the Mississippi River. His over all perception of the mighty river is utmost praise as he uses vivid adjectives such as “extraordinary” and “unpredictable” The diction presented in the passage corresponds to the exited and enthralled tone of the author, while the theme is primarily constructed of awe and appreciation. The author wants to share his love and fascination of the river with his readers, while again maintaining his tone and molding in his themes.