268 



BIOLOGY AXD ITS MAKERS 



fcssor in ihc universities of Breslau and Prague. His ana- 

 tomical laboratory at Breslau is notable as being one of the 

 earliest (iS2^) 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 ]\Iohl (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}^ cell-sap 

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

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



