Il6 NATURE STUDY- BY GRADES 



call attention to other chemical changes equally surprising, 

 e.g. cider to vinegar, lye and grease to soap, etc. 



Application of Experiments ~ What is the object of the 

 mother plant in storing up starch in the seed? What 

 change occurs in the size of the seed as it grows? Do any 

 animals provide food to sustain their young until the latter 

 are big enough to procure food for themselves? Mention 

 may be made of the large fish egg that floats about with 

 the young fish until it is all absorbed, by which time the 

 fish is large enough to hunt its food; of the mud- wasp 

 sealing up near the young larvae food for the latter when 

 it comes to life in the spring; of the ostrich and many 

 other animals, which provide food for their offspring which 

 they may never see. If, then, this starch is stored food for 

 the baby plant, how does it reach the stem and leaves to make 

 them grow? We learned in the first experiment that starch 

 will not dissolve in water ; so how can the water take it up ? 

 What will dissolve in water? Why do you think the seed 

 changes to sugar? What becomes of the water after it has 

 taken the sugar food up into the stem and leaves ? 



Experiment 4. Invert an ordinary fruit jar over a potted 

 plant in a sunny window, and let pupils see the drops of 

 moisture which collect inside the jar. 



Why would it not be wise for the parent plant to fill the 

 seed with food in the form of sugar instead of starch ? 



LESSON XL 

 FLOWERING PLANTS 



What plants bear flowers ? Make a list of wild flowers that 

 you know. Make a list of the cultivated flowers that you 

 know. 



