Slide showing six microscopic photographs of 'Normal mitosis in cells of mouse lung grown in vitro' Slide showing six black and white microscopic photographs of 'Normal mitosis in cells of mouse lung grown in vitro'. Each photograph is numbered '1' to '6'. Title below image reads: 'Normal mitosis in cells of mouse lung grown in vitro. 1 prophase; 2,3 metaphase seen from different angles; 4, anaphase; 5, telophase; 6, daughter nuceli. (Unpublished photographs by G. Lenney of material prepared by L. Lasnitzki)'. Late 19th century to early 20th century