THE CELL 



19 



terms, is a small spherical mass of protoplasm con- 

 taining a nucleus or specialised central portion. 



Protoplasm, a term first used by Purkinje in Protoplasm 

 1840 is a viscid albuminoid substance like the un- 

 boiled white of an egg. It was well described by 



centnosomcs 



D/a.orjrr> of* cell Its basis con$/$t$ of&meshworA 

 riurnerov.* minuk. gnwu.Uf (micros am ts)Af?d traversing* 

 grcicnd- substance*. FromM/son. 



FIG. I. 



Huxley as "the physical basis of life," and there 

 can be no doubt that it is "the immediate sub- 

 stratum of all vital activity ". To attempt to 

 enter into any complete description of this most 

 important substance would be impossible, even if 

 it were advisable in a work of this character, but 



