STEMS 139 



Now transfer it to a 5 per cent solution of common salt, 

 and let it remain for a short time. Again note rigidity. 

 What has happened? Put it into water again and note 

 the result. Explain. Compare the behavior of these plants 

 with roots treated with strong fertilizers. 



124. TURGOR 



Object. To show the effect of turgor on a dandelion. 



Method. Split a dandelion flower stalk into two or four 

 parts. What happens? Place it in clear water for five min- 

 utes. What occurs? Remove it and immerse in 5 per cent 

 salt solution. What happens ? Return it to water and note 

 the result. What causes these changes of curvature? 



125. TURGOR 



Object. To show the effect of turgor on beet root. 



Method. Immerse some thin slices of beet root in water 

 and after ten minutes examine them. Now place some in 5 

 per cent salt solution and others in strong syrup of sugar. 

 After one or two hours examine. How do those in the salt 

 solution and those in the sugar solution compare with those 

 which have been left in the water ? Repeat this experiment, 

 using slices of cooked beet instead of raw beet. Is there 

 any difference in the results ? 



Then place those which were in salt and those which were 

 in sugar again in fresh water. Examine again after half an 

 hour. What result? Why? 



Query. How are these experiments related to those 

 on osmosis? How do they tend to explain the recovery of 

 plants after a shower ? 



