How the Snake Lost Its Legs fly embryo. His books on evolutionary developmental biology (evo-devo) include "Imaginal Discs: The Genetic and Cellular Logic of Pattern Formation" (2002), "Quirks of Human Anatomy: An Evo-Devo Look at the Human Body" (2009), and "Deep Homology? Uncanny Similarities of Humans and Flies Uncovered by Evo-Devo" (2017). In Held's view, "Quirks", "Snake", and "Deep Homology" form a trilogy on evo-devo. "How the Snake Lost Its Legs" is ostensibly organised into six chapters, but in effect into three parts. The first chapter serves as an introduction and overview. The next four chapters provide what Held calls "the meatier aspects of evo-devo" with
To a Butterfly To a Butterfly "To a Butterfly" is a lyric poem written by William Wordsworth at Town End, Grasmere, in 1802. It was first published in the collection "Poems in Two Volumes" in 1807. Wordsworth wrote two poems addressing a butterfly, of which this is the first and best known. In the poem, he recalls how he and his sister Dorothy would chase butterflies as children when they were living together in Cockermouth, before they were separated following their mother's death in 1778 when he was barely eight years old. The 'Emmeline' of the poem is Wordsworth's sister Dorothy. The day