Waclaw Mayzel descibed as the first the process of the mitotic division in animal cells (the frog, rabbit and cat cornea). He published his observations in the journals: Medycyna, czasopismo tygo- dniowe dla lekarzy (1875; 3(45), 409–412 dated 25. 10. 1875) and in Centralblatt f. die Med. Wissenschaf- ten (1875; 50: 849–852). Scan of his original paper archived in the Jagiellonian Library follows the present article.