In the spring of 1859, in the company of Joseph Prestwich, Evans visited Abbeville to view Boucher de Perthes’ collection of flint artifacts and to observe a hand-axe in situ at St. Acheul in a deposit containing the bones of extinct animals. Both men came away convinced that Boucher de Perthes had found evidence of prehistoric man, and both issued papers on what they had seen, Evans’ paper emphasizing the archaeological point of view, and Prestwich’s report emphasizing the geological one. With the publication of Prestwich’s and Evans’ papers, the scientific establishment finally began to be convinced of the validity of Boucher de Perthes evidence for human prehistory. Prestwich delivered his paper to the Royal Society in May, 1859, and Evans delivered his paper to the Society of Antiquaries on June 2, of that year. Evans’ paper was the first to appear in print, however, since the publication of Prestwich’s paper was delayed until 1861. 

For offprints of his paper Evans took the unusual step of changing the title to Flint implements in the drift; being an account of their discovery on the Continent and in England. In the process he also had the pages renumbered from 1-28, and had two plates from John Frere's paper published in Archaeologia in 1800 (No. 7291) reprinted and included as  extra illustrations in the offprints only. Digital facsimile of the offprint from Google Books at this link.