276 HISTOLOGY OF STEM OF THE WAX PLANT 



Fig. 6. Medullary ray. Longitudinal radial section. Page 30. 

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

 All figures magnified 200 times linear. 



Plate II 



Figs. 1 and 4. Cross-section of stem showing irregular growth of wood. 1 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. 5-5^. Different forms of wood cells. X 200 linear, p. 29. 

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

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

 Figs. 8-85. Bast fibers showing manner of striation. X 200 linear. 



