268 



BIOLOGY AND ITS MAKERS 



fessor in the universities of Breslau and Prague. His ai 

 tomical laboratory at Breslau is notable as being one of th( 

 earliest (1825) open to students. He went to Prague in 

 1850 as professor of physiology. 



Von Mohl. — In 1846, eleven years after the discovery oi 

 Dujardin, the eminent botanist Hugo von Mohl (1805-1872' 

 designated a particular part of the living contents of the vegc 

 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 know 

 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, 



I 



