268 BIOLOGY AND ITS MAKERS 
fessor in the universities of Breslau and Prague. His ana- 
tomical laboratory at Breslau is notable as being one of the 
earliest (1825) open to students. He went to Prague in 
1850 as professor of physiology. 
Von Mohl.—In 1846, eleven years after the discovery of 
Dujardin, the eminent botanist Hugo von Mohl (1805-1872) 
designated a particular part of the living contents of the vege- 
table cell by the term protoplasma. ‘The viscid, jelly-like 
Fic. 84.—Cart NAGELI, 1817-1891. 
substance in plants had in the mean time come to be known 
under the expressive term of plant ‘‘schleim.” He distin- 
guished the firmer mucilaginous and granular constituent, 
found just under the cell] membrane, from the watery cell-sap 
that occupies the interior of the cell. It was to the former 
part that he gave the name protoplasma. Previous to this, 
