276 HISTOLOGY OF STEM OF THE WAX PLANT 



Fig. 6. Medullar}' ray. Longitudinal radial section. Page 30. 

 Fig. 7. Milk cell from outer band of parenchyma. 

 All figures magnified 200 times linear, 



Plate II 



Figs. I and 4. Cross-section of stem showing irregular growth of wood, i X 10 



times linear; 4 X 40 times linear, p. 24. 

 Fig. 2. Tangential section of old stem showing lenticular form of penetrating 



parenchyma. X 10 times linear. 

 Fig. 3. Short duct from old stem showing manner of pitting. 3a, disk that 



occupies space above it. X 400 linear, p. 27. 

 Figs. S~5^- Different forms of wood cells. X 200 linear, p. 29. 

 Fig. 6. Crystal from pith of young stem. X 200 linear, p. 11. 

 Fig. 7. Sclerotic cells from girdle of stem. X 200 linear. 

 Figs. 8-8b. Bast fibers showing manner of striation. X 200 linear. 



