STONE WOET 275 



lower, or root end, from an upper, or stem end ? 

 How? Do you ever find roots except at one end 

 of the plant ; i. e., does the plant ever take root at 

 the joints ? 



c. Size. — Select four or five plants and measure their 



length. Do you get any very great variations in 

 length ? If so, how do you explain them ? Any 

 variations in diameter? How much of the length 

 do you consider to be " root end " ? How do 

 length and diameter compare ? 



d. Color. — What is the general color of a single plant ? 



Does the color vary in different portions of the 

 plant body? If so, where is the color deepest? 

 Where lightest? How do you explain these 

 facts? 



e. Structure. — Does the main stem bear appendages 



or branches? If so, do they originate at any 

 particular points ? How do they compare in gen- 

 eral appearance with the main stem ? Do the 

 branches in their turn branch also ? ISTote the 

 circles or whorls of leaves on the stem. How 

 do you distinguish leaves from branches? Where 

 are the whorls most numerous ? Do they occur 

 at definite points ? Do you find them on the 

 branches? Are the leaves regularly arranged 

 in the whorls ? Do you find green and orange 

 colored bodies, reproductive organs, on the 

 leaves ? Do you find these bodies elsewhere than 

 on the leaves? Are the leaves subdivided into 

 leaflets ? If so, how do you distinguish the latter ? 

 Note that the main stem consists of a series of 

 segments or internod.es which meet at joints or 

 nodes. Do you find that the appendages like- 



