140 



STEMS 



126. TURGOR 

 Object. To illustrate turgor. 



Method. Fill a 30-cc. vial to the brim with a saturated 

 solution of sugar or very thick syrup. Tie over the top a 



piece of fish air bladder or 

 sheep gut which has been 

 thoroughly soaked in water. 

 Be sure that no air is con- 

 tained in the bottle. 



Immerse the whole in a 

 beaker of water and let it 

 stand for forty-eight hours. 

 Remove it from the water 

 and notice the condition of 

 the membrane. How does 

 it differ from its previous 

 FlG - 55 ' condition? Why? 



Now puncture the membrane with a fine needle. What' 

 happens when the membrane is punctured? Explain this. 



127. TURGOR 

 Object. To show the effect of turgor in an egg. 



Method. Place an egg in a cup. Cover with vinegar or 

 dilute acetic acid and let it stand until the shell has been 

 dissolved. If vinegar is used, this will require twelve hours. 



Immerse the egg in a glass of water for one or two hours. 

 Remove it and examine the egg. Is it hard or soft? How 

 do you account for its condition? Now place the egg in a 

 saturated solution of salt and after two hours again examine 

 it. What difference ? Return it to the water. What result ? 



