A GENERALIZED PLANT 15 



above. Describe the effect on the cell. 



What condition has been restored? 

 Make a diagram, at least 25 mm. in diameter, show- 

 ing the appearance of a cell in imaginary cross- 

 section taken through the nucleus. 

 Do you think Spirogyra is a unicellular or a multi- 

 cellular plant? If the latter, how many, cells con- 

 stitute one plant? Give reasons for your opinion 

 either way. 



NOTE. If time permits, the study of cell-structure may be ex- 

 tended by observing the cells in young leaves of Elodea, the skin 

 (epidermis) of onion scales, the basal cell of the hairs on any seed- 

 ling cucurbit, or the cells of the.stamen hairs of Trades cantia. 



