THE TEACHING BOTANIST 



necessary to make full records for them.) By 

 comparison of the three plants determine, and 

 express in words : 



(1) Have leaf and bud any constant rela- 



tionship of position ? 



(2) In what positions do flowers (or fruit) 



originate ? 



(3) Do leaves and stem increase in size in 



some special part, or through their 

 entire extent ? 



(4) Is there any regularity in the position 



of origin of leaves on the stem ? 

 (Invent simple and logical diagrams 

 to show the leaf arrangement in the 

 three plants.) 



(5) In what positions do new roots origi- 



nate ? 



25. Diagram the geotropism of the Coleus shoot. In 



one diagram express the ideal arrangement, and 

 in another its disturbance by light from one side. 



26. In growth, such as you have been studying, very 



important physiological processes occur. From 

 common observation and experience, which may 

 be tested by simple experiments, every one 

 knows that warmth and moisture are necessary 

 to all stages of growth, including germination of 

 seeds. Particularly important, in growth as in 

 many other physiological processes, is its rela- 



