THE A WAKENING OF TEE SEED 51 



which the seeds are placed and which has been pierced 

 with a few holes to admit water: if the bottom of the 

 outer cup is not flat, a disk of wood should be fitted 

 beneath it so that the pressure will not spring it. In 

 the smaller cup is placed a block, on which rests a 

 small iron support. For a lever we use an iron rod 

 one inch thick and three feet long, secured at the end 



39. Arrangement for testing the swelling power of a mass of seeds (a portion of the 

 outer cup is represented as cut away in order to show the seeds). 



by an eye -bolt, as shown in the figure. For weights 

 we may use ordinary fifteen -pound iron hitching- 

 blocks, suspended from the lever by hooks. An 

 upright ruler near the end of the lever serves to 

 indicate its position. The whole apparatus rests upon 

 a suitable board about three feet long. 



^e commence the experiment by filling the larger 

 cup about half- full of dry beans (Pink Beans give 

 excellent results) and arranging the apparatus as 

 shown in the figure (the height of the lever may be 



