How the Snake Lost Its Legs the butterfly, the snake, and the cheetah. Each consists of three to eight sections named in the style of Rudyard Kipling's "Just So Stories", with titles like "How the butterfly got its spots" or "How the snake elongated its body", though a couple of sections use "Why?" rather than "How?", as in "Why the fly twirls his penis" (it rotates during embryonic development under the control of different genes). In these chapters, Held explains the mechanics of evolutionary developmental biology, complete with accounts of what genes such as hox, hedgehog, and engrailed do to shape bodies. The third part is
The Bells (poem) form: first movement, slow movement, scherzo, and finale, thus honoring the poem's four sections. (The work is sometimes performed in English, using not Poe's original, but a translation of Balmont's adaptation by Fanny S. Copeland.) The Scottish composer Hugh S. Roberton (1874–1947) published "Hear the Tolling of the Bells" (1909), "The Sledge Bells" (1909), and "Hear the Sledges with the Bells" (1919) based on Poe's poem. Josef Holbrooke composed his "The Bells, Prelude, Op. 50" on Poe's poem, and American folksinger Phil Ochs composed a tune to the poem recorded on his album "All the News That's Fit to Sing".