30 



PROTOPLASM AND THE CELL. 



), the hollyhock (Althaea), and certain species of gourds 

 Mta). It may be conveniently studied in the hairs upon 

 the stamens of the cultivated spiderwort (Tradeacantia). The 

 flower of this plant is shown in Fig. 18, a, and one of the 

 stamens with its hairs at I. Each hair consists of a single row 



. 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; n, 

 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 (primordial utricle) 



