Columbia subject headings:
Harvard subject headings:
Du Bois-Reymond, Emil, 1818-1896.
Laboratories--History--19th century.
Physiology, Experimental--History--19th century.
Physiology--Germany--History--19th century.
Research--History--19th century.
Scientific apparatus and instruments--History--19th century.
Princeton subject headings:
Du Bois-Reymond, Emil, 1818-1896.
Laboratories--History--19th century.
Physiology, Experimental--History--19th century.
Physiology--Germany--History--19th century.
Research--History--19th century.
Scientific apparatus and instruments--History--19th century.