This is a revised critical edition of philosopher and scientist, Francesco Patrizi''s manuscript, Il Delfino, overo del bacio (c.1555), with an English translation and commentary. Il Delfino, or ‘The Kiss’ survives in a single manuscript, compiled by an assistant and interspersed with autograph corrections by Patrizi himself. The only modern critical edition of the text, edited by Danilo Aguzzi Barbagli (1975), is known to contain many errors that prevent a correct understanding of the work. This book therefore fills this historiographical gap and at the same time provides a reliable text for further translations of Patrizi''s work into other languages.