PHYSIOLOGY 



Wi^te ft 



Fig. l.—A, a hair from the stamens of spiderwort ; B, a single cell enlarged. The 

 circulation of the protoplasm is indicated by the arrows; n, nucleus. (From 

 Sedgwick and Wilson.) 



substance slowly streams about (Fig. 1, B). This granu- 

 lar substance is the living substance, or protoplasm, 

 as it is usually called. The most remarkable thing that 

 we notice about it, is that it moves apparently without 



