Johannes Peter Muller, German physiologist, c 1850.

Photogravure after a painting by Begas. Johannes Peter Muller (1801-1858) was profesor of physiology and anatomy at Berlin University from 1833 until his death in 1858. He became famous for his research in various fields, including embryology, pathology, biochemistry, comparative anatomy, psychology and marine zoology. He also proposed the physiological law of specific energies in 1840, which dictates that each sensory nerve produces its own specific sensation to a stimulus. From a collection of portraits of scientists published by Photographische Gesellschaft, Berlin, c 1910. Dimensions: 460mm x 340mm.