30 



PROTOPLASM AND THE CELL, 



cantia)^ tlie liolljliock {Altlima)^ and certain sj^ecies of gourds 

 {Cucxii'ljitci). It may be conveniently studied in the liairs upon 

 the stamens of the cultivated spiderwort {Tradescantia). The 

 fiower of this plant is shown in Fig. 18, «, and one of the 

 Btamens with its hairs at h. Each hair consists of a single row 



A 



1^. 



;.\^ 





c ' • i; ■;'':■*! •■- ••■• .••"-••"<■ • • *1 



fl-lI;f;|■:;■!•^?■•^ 



iifl^^vK^^ 



'.^^<t^?=«,,o^ 



^ 









^> '^ ■•:■■■-:*/•-■■ ^ • ••> ;->'6-. 6»>i-r 

 ■ » ". *i \ .V ;''.,; ^ ^ ■ / *. N ft: '*■ **> ■ / /T 



.^ . « - w i* '•••.&."& -■■',/ '. ■• •*, * P ^ ' » 



v^ v-:-; >->-,;^\',i:^,..^? 



Fig. 19.— Enlarged cells of the hairs from the stamens of the spiderwort. A, five 

 cells, somewhat enlarged, protoplasm not shown ; B and G, cells much more en- 

 larged, showing the circulation of protoplasm as indicated by the arrows ; ?i, 

 nucleus. 



of elongated cells covered by delicate membranes and connected 

 by their ends. As in Nitella^ the protoplasm does not fill the 

 cavity of the sac, but forms a thin lining {jprimordial utricle) 



