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 



FIG. 84. CARL 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 water) 7 cell-sap 

 that occupies the interior of the cell. It was to the former 

 part that he gave the name protoplasma. Previous to this, 



