Thomas Saunders Evans’ Greek poem Mathematogonia. The mythological birth of the nymph Mathesis (1839) is one of the outstanding products of the British compositional tradition. The article begins with a brief account of Evans and of the historical context of the poem, which also belongs to the history of mathematics in Britain, and in particular, its teaching in nineteenth-century Cambridge. This is followed by a preliminary note on Mathematogonia; a reproduction of the text of the poem, with Evans’ original preface and notes; an English translation; notes detailing Evans’ sources and borrowings from Tragic texts; and an appendix listing the changes he made after its first publication. The aim is to show what Evans wrote, and to explain what prompted him to do so.