HISTOLOGY. 



21 



PROTOCOCCUS. 



Showing morphology, grouping and fission. 



2. When the cells have begun to vegetate place 

 some of them on the slide and irrigate with water. 



3. Cover with cover-glass and examine. 



4. Use H. P. and observe grouping, cell contents, 

 and reproduction. 



5. Irrigate with acetic acid and search for a nucleus. 

 The lesson here is to find some reagent that will find 



a nucleus without staining the preparation. Acetic 

 acid is the one. This is used in all of our work when 

 we look for a nucleus. 



