30 



LIVING MATTER OR PROTOPLASM. 



either in the peripheral layer or at some point in the network, and 

 the threads of the latter always converge more or less regularly to 

 it. In active cells currents continually flow to and fro throughout 

 the whole mass of protoplasm. In the threads of the network 



A 



.. ":, : .'.'": ..' ? '-..:V 

 .- ";: ...' <<.'. *t . : - ^ , ' 



'-: .". t -.' ". om ''A ' r , " .'< '. ' i 1 

 -, f, ; &> t'> . . 



-.': >>. ^.-V' '', ?..,'- , 



;'->'RV'V||ili;;> 





: J -',.. , . i 



'.:''; - - - ' . ' .'-.:' '' . ' 



f ' ?.-%,' .. : '>? -":'" 



--''> '" ' ', , ''>*;,'' 



' ,'-- "I ."_. J . .n - . 



' ;'. " o *" 



; . -, . " e -. "-...; ' . .' C : 



FIG. 18,-Enlarged cells of the hairs from the stamens of the spiderwort. A, five cells 

 somewhat enlarged, protoplasm not shown; B and C. cells much more enlarged, showing 

 the circulation of protoplasm as indicated by the arrows; , nucleus. 



granules are borne rapidly along, gliding now in one direction, 

 now in another ; and although the flow is usually in one direction 

 in any particular thread, no system can be discovered in the com- 

 plicated movements of the whole. In the larger threads the 

 curious spectacle often appears of two rapid currents flowing in 



