228 



TYPICAL FRUITS 



Suggestion. Examine the wool of a sheep or the tail 

 of a cow and find if any seeds are clinging there. After 



FIG. 101. A, sticktights ; B, sticktights, magnified ; C, burdock ; 

 D, cocklebur. 



a walk through the woods in summer or early fall what 

 fruits will be found clinging to your clothing ? 



196. SEED DISPERSAL 



Object. To demonstrate seed dispersal by explosive 

 fruits. 



Apparatus. Witch-hazel fruits which are ripe but not yet 

 bursting, wide-mouth bottles, damp sand or moss, and formaldehyde. 



Method (Laboratory). Gather the witch-hazel fruits and 

 place them in the bottles of damp sand or moss to which has 

 been added enough formaldehyde to prevent decay. A few 

 drops of 4 per cent solution is sufficient. When you desire 

 to show the phenomenon of seed dispersal by explosive 



