MOVEMENTS OF PROTOPLASM 



235 



actively dividing, the protoplasm may entirely iill the 

 spare and no vacuoles be present. 



386. MOVEMENTS OF PROTOPLASM. Wit hill the cell- 

 wall, many times the protoplasm shows a tendency /<> movt 



front place to place. This movemenl is 

 chiefly of two kinds: (1) circulation, or 

 movement not only along the walls Lnt 

 also across the cell -body, as seen in the 

 long, thin-walled cells of celandine: in 

 the stamina] hairs of tradescantia (Fig. 

 386); in the bristles of squash vines; in 

 the stinging hairs of nettle; in stellate 

 haii's of hollyhock. (2) rotation, or 

 movement along the walls only, well sen 

 in the cells of many water plant-, as 

 elodea, chara, and nitella (Fig. 387). 



387. Besides these and other move- 

 ments of protoplasm within the cell -wall, 

 there are also movements of naked proto- 

 plasm, of two main types: M) amoeboid 

 or creeping movements, such as may be 

 seen in a Plasmodium of myxomycetes, or 

 in an amoeba; (2) swimming by means 

 of cilia or flagella, illustrated in the 

 swarm-spores of water fungi, and of some 

 alga', and in motile bacteria. I ">.\ the last 

 t \ pe of movemenl t he unicellular bodies 



. toplatin in eel 



(swarm-spores and bacteria) arc often trad 



PHmnl in or * p i ! i 



moved very rapidly. 

 in protoplasm, carefu 



I o 



M .;:>" 



see movemenl 



> i mi in watei 



a few hairs from the Btamens of tradescantia (spider won). 

 The water should not be too cold. Examine with a power 

 high enough to Bee the granules of protoplasm. Make a 

 sketch of several cells and their contents. It maj be 

 i iccr-. -vary to make several trials before success is attained 



