EXERCISE A-13. TO SHOW THAT PLANTS GIVE OFF 

 MOISTURE THROUGH THEIR LEAVES. 



Equipment: Small potted plant; wide-mouthed jar; 

 piece of cardboard; wax.* 



Method: Use a plant 

 which is at least three or 

 four inches high and grow- 

 ing in a flower pot or 

 tomato can. Cut a slit in 

 the cardboard from the 

 middle of one side to the 

 center, and place the card- 

 board around the plant- 

 Seal up the sht in the card- 

 board with wax. Now in- 

 vert the glass jar over the 

 plant and place in a sunny 

 window. How do the drops 

 of water get into the glass 

 jar? 



Discussion: Plants are 

 constantly giving off water 

 from their leaves. The Fig. 14. 

 k'-gest amount is evap- 



* Beeswax, paraffin, or graft- 

 ing wax will be found quite satis- 

 factory. 



Potted Plant AiTanged to 

 Show that Plants Give off Moist- 

 ure through their Leaves. If 

 placed in a sunny window, drops 

 of moisture soon coUect on the in- 

 side of the can. 



27 



