256 



GENERAL BOTANY 



In order to see the reason for, or the effects of these ap- 

 pendages, drop various winged seeds from the height of a 

 few feet, or throw them up into the air in a light breeze, 

 and mark how far they are carried by the wind. Then 

 cut off the wings and do the same. You will find con- 

 siderable differences in the distances the seeds are carried 

 in the two cases, especially if the wind is fairly strong. 



FIG. 57. FRUIT AND SEEDS OF SWIETENIA MAHOGANI, L. 



Now, you have only to go into a garden where trees 

 which naturally grow in the open, are planted too 

 close together, or where seedlings have been allowed 

 to spring up under the shade of trees, to see that 



