EXPLANATION OF THE ILLUSTRATION 
Ficure 1, Typical nucleus in fiber-tracheid. < ca. 2160. 
Ficure 2. Metaphase division figure in fiber-tracheid. 
ca. 2160. 
Ficure 8. Anaphase division figure in fiber-tracheid. 
~ ca. 2160. 
Ficure 4, Telophase division figure in fiber-tracheid. 
Xx ca. 2160. 
Ficure 5. Rate telophase division figure in fiber-tra- 
cheid. ca, 2160, 
Ficure 6. Portion of septate fiber-tracheid, showing 
septum and two nuclei. » ca. 1410. 
These drawings were made with an Abbé camera lucida 
at table level, 
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