128 HOW NATURE STUDY SHOULD BE TAUGHT 



The writer has experimented with these food- 

 tablets in a great variety of methods and always 

 with success. They are used in the university 

 and in the kindergarten. The technical botanist 

 appreciates their convenience, and the youngest 

 child, mixing a little sawdust in a teacup and 

 growing a few plants in it, finds entertainment 

 and instruction. 



Plants may also be easily grown without even 

 a shelf or a table. All that is needed is a wide- 

 mouthed bottle, filled with pebbles. Climbing 

 plants may thus be easily trained around the 

 window, from jars hanging at the side of the 

 frame. 



When large plants are growing in small vessels, 

 I am often asked, " Where are the roots ? " The 

 only explanation that I can offer is, that under 

 this artificial feeding the plants seem to require 

 the roots to be few and short. I have grown at 

 least a dozen plants to a height of more than two 

 feet from sawdust held in two-thirds of an egg 

 shell. 



