304 BOTANICAL GAZETTE [October 



extent of epidermal cells, increase in thickness of the outer wall of 

 the epidermis and of the cuticle accompanied by ridging, increase 

 in palisade, in hairs, in conductive and mechanical tissues; of the 

 stem, decrease in the length of internodes, increase in the number 

 of vessels and in the area of their cross-sections, giving greater 

 conductive space, increase in thickness of the walls of vessels and 

 of the fibers accompanied by decrease in lumen of fibers, giving 

 more wood, increase in the number of growth rings in stem of a 

 given size, showing slowness of growth, increase in mechanical 

 tissues outside the wood, and increase in cork. 



Mt. Holyoke College 

 South Hadley, Mass. 



LITERATURE CITED 



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fig- 



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