THE EARLY DEVELOPMENT OF THE BARLEY PLANT 219 



date of seeding.) Make drawings of the plants at the differ- 

 ent stages of growth and from the different depths of planting. 

 Show in drawings the five temporary roots which develop 

 first, and in other drawings the permanent roots which de- 

 velop somewhat later, and are sent out in whorls from the 

 nodes. Show how the distance between the temporary roots 

 and the whorl of permanent roots depends upon the depth of 

 planting. Show how the older plants, by sending out new 

 stems, begin to tiller. Group the drawings so that they will 

 appear well on the page. The drawings should include the 

 root system, stems, and leaves and their arrangement. 



