We reedit in the dossier of this issue an essay of Luigi Luzzatti first came out in «Nuova Anthologia» in 1880. In it Luzzatti rereads the British constitutional history thanks to a set of biological metaphors and analogies, which are analyzed and historically framed in the introduction of Luca Ciancio. This approach of Luzzatti further enhances the reconstruction of history of Constitutions he offers analyzing the works of the greatest historians of his time
