In the Lehrbuch, Leydig reviewed the crucial developments in the history of histology, including the discovery and definition of the cell by Jan Evangelista Purkyne (1797–1869), Gabriel Gustav Valentin (1810–1883), and by Theodor Ambrose Hubert Schwann (1810–1882), who described the cell as a vesicle containing a nucleus in 1839. Leydig paid further tribute to other contemporary anatomists, particularly Johannes Peter Müller (1801–1858) for his work on glands and emphasizing cellular doctrine for pathology.
In the Lehrbuch, Leydig reviewed the significant advancements in the history of histology, including the discovery and definition of the cell by Jan Evangelista Purkyne (1797–1869), Gabriel Gustav Valentin (1810–1883), and by Theodor Ambrose Hubert Schwann (1810–1882), who described the cell as a vesicle containing a nucleus in 1839. Leydig paid further tribute to other contemporary anatomists, particularly Johannes Peter Müller (1801–1858) for his work on glands and emphasizing cellular doctrine for pathology.