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parts which are of a different color from the 

 surrounding tissue ? From the margin ? If so, 

 how many of each kind are there, and how are 

 they arranged ? 

 Make a drawing of the cross-section, showing its shape 



and the position of the various tissues. 



Divide a portion of the rhizome through the 

 middle lengthwise. How do you find its tis- 

 sues to be arranged ? Look for strands of 

 fibrous tissue. In what direction do they run ? 

 With a fine scalpel carefully remove the tis- 

 sue surrounding these strands. "What is their 

 arrangement in the rhizome? Do they enter 

 the leaves and roots ? These strands may be 

 more easily traced if the rhizome be soaked for 

 a few hours in ten per cent, hydrochloric acid. 

 This macerates the softer tissues, which may 

 then be picked away from the fibrous bundles. 

 Make a drawing showing the arrangement of these 



bundles. 



3. The roots. — Are they numerous or few ? What 

 is their color ? Are they rigid or flexible ? Do 

 they interlace in a mass or spread out ? Do 

 they branch ? If so, are the branches given off 

 in definite order ? What is the average length 

 of a root ? Diameter ? Cut a large root in two 

 and examine the cut end. Is the root made up 

 of tissues visible without using a microscope ? 

 If so, how do you distinguish them ? Is the 

 surface of the roots smooth ? Examine one of 

 the smallest roots with a lens. Notice the fine 

 root hairs. Do they grow at the extreme 

 end of the root ? If not, how far from the end 

 do they stop ? ITote the white growing end. 



