THIS AWAKENING OF TEE SEED 



13 



The experiment may be repeated in a different form 

 by placing the seeds in moist sawdust instead of in 

 water. Care must be taken that none of the rubber 

 is removed in manipulating the seeds. 



This experiment requires a balance. If you have 

 none at hand you should make one for yourself. The 



17. A home-made balance constructed of ximbrella wire; it can be made sensitive 

 to a tenth of a gram. 



arms of the balance should be of equal length. Why ? 

 Try the effect of both equal and unequal arms. The 

 pans should be attached at equal distances from the 

 pivot. A very good balance is easily and quickly 

 made of umbrella- wire, as shown in Fig. 17. The 

 long rib is used for the arm of the balance, the short 

 rib for the support. The rivet is taken out and a fine 



