2 Practical Plant Biology. 



here, and by means of a^(or<&e.ps lay it on the drop containing the 

 piece cf skin. * ** fc ^ 



In cleaning the cover-glass, gently hold it by the edges with 

 the finger and thumb of the left hand, while the finger and thumb 



Eye-piece 



Sub- / Condenser 

 stage I. Iris Diaphragm 



Mirror 



Base 



FIG. i. The microscope. 



of the right hand, covered with a fold of fine linen, may rub it 

 clean, simultaneously pressing from both sides. 



The piece of skin thus enclosed in a drop of water between the 

 slide and cover-glass is a preparation ready for microscopic ex- 

 amination. Very probably a large air-bubble will be found in the 

 preparation. This may be no disadvantage, if it is not in contact 



