1 8 GREEN SLIME. 



Under high power notice: 



3. The individual cells; either single or associated in groups. 



4. The size of the cells; some small, some several times 

 larger. By means of a stage micrometer determine the 

 actual size of a few of the cells. 



5. The shape; when free, and when in groups. 



6. The cell contents; more or less granular, and always 

 green from the presence of chlorophyll. 



7. The colorless cell-wall surrounding each cell. 



Press upon the cover-glass with a back-and-forth movement 

 and the walls of many of the cells and cell families will be 

 ruptured and their contents ejected, when the wall can be 

 studied easily. 



Stain a fresh specimen with iodin, and observe: 



8. The brownish-yellow color given the contents of the cell, 

 showing the presence of protoplasm. 



9. The separate chlorophyll bodies, 1 or chloroplasts. 



10. The nucleus. 



11. REPRODUCTION. 



1. The cell multiplication, or vegetative reproduction. Ex- 

 amine various specimens and trace the successive stages 

 in the division of a single cell to form a cell group. 



2. Illustrate the various structures, and also method of repro- 

 duction, by drawings. 



ANNOTATIONS. 



Pleurococcus is a unicellular plant, for each cell performs 

 individually the various functions pertaining to plant life; 

 and this is true whether the cells do not separate after 

 division or remain adherent in small colonies. 



1 If the cells are properly stained, they will usually remain green, 

 but of a brighter and more bluish hue. 



