12 BOTANY. 



doubtless because of the mechanical injury of the cells in making the 

 preparation, and the disturbing influence of the water in which it is 

 mounted. 



(c) In the stamen-hairs of Tradeseantia Virginiea the protoplasm 



Fig. 7. —An optical sertion of a cell of one of the stamen-hairs of Tradeseantia 

 yirglnica^ after treatment with a Bolution of sugar. The protoplaBmic sac has 

 partly collauBed, on account of the withdrawal of tome of the interior water hy the 

 sugar solution. At the bottom of the cell is the larse nucleus ; in the strings and 

 bands of protoplasm there are streamings of the protoplasm, shown hy the arrows.— 

 After Hofmeistt-r. 



forms a rather thick layer over the inner surface of the cell-wall, and 

 in some part of tliis layer the nucleus lies imbedded. From the nucleus 

 and from various parts of the protoplasmic layer there pass to the 

 opposite side of the cell thicker or thinner bands and strings, always. 



