Chief among them may be mentioned Virchow, Helmholtz, Du Bois-Reymond, Schwann, Lieberkuhn, the discoverer of the follicles in the intestines; Max Schultze, whose work in histology and physiology are well known; Claparede, Remak, Guido, Wagener, Lachmann and Reichert.
"Makers of Modern Medicine"
James J. Walsh
I turn to an unopened bud, putting on a lower power, and viewing it as an opaque object, with reflected light by the aid of the Lieberkuhn.
"The Romance of Natural History, Second Series"
Philip Henry Gosse