EXPERIMENTS AND PRACTICAL WORK 57 



water; place it in the sunshine, and notice the rise of 

 bubbles of oxygen. This gas may be collected by put- 

 ting a funnel over the leaves and inserting a test tube 

 with water (see fig. 25). Test for oxygen by carefully 

 removing the test tube and inserting a glowing taper. 



Expt. 80. Plants take in Oxygen and give out Car- 

 bon Dioxide. Put some growing shoots in a bottle con- 

 taining a little water; cork tightly and put in the dark. 

 In about twenty-four hours test with lime-water and 

 observe the precipitate due to the carbon dioxide given 

 out by the young shoots. 



HOW PLANTS ARE REARED I and II 



(See Tropical Readers, Book II, pp. 74-79.) 



Expt. 81. Necessity for Selection of Seed. Select 

 seeds from the best fruit of four trees that have been 

 noticed to bear well. Plant in a suitable position and 

 well-prepared soil about your home. 



Expt. 82. Sowing of Large Seeds. Plant mango, 

 pear, cocoa, and orange seeds in a nursery bed in the 

 School Garden. 



Expt. 83. Sowing of Small Seeds. Plant tobacco, 

 lettuce, and cabbage seeds in boxes protected from ants; 

 plant some of each thickly, and others thinly, and in 

 regular furrows; note that those sown thinly and regu- 

 larly produce much stronger seedlings and are more 

 easily transplanted. 



Expt. 84. Careful Watering of Seedlings. Regu- 

 larly water the seedlings without damaging them. 



Expt. 85. Transplanting Seedlings. When they are 

 sufficiently grown, move the seedlings, with as much 

 earth as possible around the roots; plant out in beds. 



