MANUAL OF NATURB STUDY. 91 



Show that the material -absorbed in solution 

 by the roots must be conveyed to the leaves for 

 making into plant substance, and that this solu- 

 tion is sap. The leaves receive the sap from the 

 stem, as raw material. By the action of sunlight 

 this raw material and .carbon-dioxide are changed 

 into plant-substance and distributed to the growing 

 parts of the plant. 



Further than this, sap cannot be discussed in 

 this grade. 



3. Study of useful roots and tubers^ as beets ^ 

 potatoes^ etc. — a. Form. b. Structure, c. Uses. 



This topic has been sufficiently covered in (2) of 

 this course. 



4. Study of grains and grasses, as wheat, corn, 

 oats, timothy, clover, etc. — a. Harvesting, b. Mar- 

 keting, c. Commercial value. 



Unfortunately, it is difficult to obtain material of 

 growing wheat, oats and timothy during school year. 



If possible to bring these to maturity by plant- 

 ing in boxes, do so, and consider them all at the 

 same time. 



Points to be observed : 



1. Kind of stem, whether hollow or pithy. 



2. Bxamine the nodes to see if the hollow, or 

 pith, continues throughout the entire length of the 

 st?ilk, 



