HISTOLOGY. 23 



1. Obtain from a pond or brook a small quantity of 

 the growth and place it in a glass vessel with some 

 water. 



2. Examine with H. P. 



3. Search for nucleus, note the shape of the cells, 

 note the arrangement o>f the cells in the filament, ob- 

 serve the arrangement of the chlorophyll in the cells, 

 irrigate with acetic and make drawings. 



Exercise No. 10. Irrigation. 



1. Place the cover glass on the spread. 



2. Place a drop of reagent on one side of the prepa- 

 ration and a piece of blotting paper on the other. 



3. Look through the instrument. 



4. Note what you see and draw. 



Any reagent may be used for irrigating. Irriga- 

 tion is only used on fresh spreads. 



E.rcrcise No. n. The Slipper Animalcule. 



1. Take some of the scum from the top of the hay 

 infusion. 



2. Examine with H. P. 



3. Make out all the structures of the animal, note 

 and draw. 



