Except for lines two and five (each an iamb) and lines eight and nine (each an amphibrach), no two lines have the same metrical form.[1] The consonance of the letters "Th" in lines two, three, and four, as well the consonance of the letter "F" in lines eight and nine, and the letter 'S' in lines eleven and twelve give rise to a natural rhythm when the poem is read aloud.