LEGEND FOR FIGURES 24 TO 36 



Figures 24-27. Fourth internode of cocklebur grown at a temperature of 

 65°C. Figure 24. Stem of plant grown with complete nutrient supply. Figure 

 25. Stem of plant grown without calcium. Figure 26. Stem of plant grown 

 without calcium and treated with a-naphthaleneacetamide. Figure 27. Stem 

 of plant grown with calcium and treated witha-naphthaleneacetamide. Figures 

 28-30. Second internodes of hemp. Figure 28. Stem of control plant. Figure 



29. Stem of plant given an aqueous spray of a-naphthaleneacetamide. Figure 



30. Stem of plant treated with a-naphthaleneacetamide in lanolin. Figures 

 31-33. Fourth internodes of hemp. Figure 31. Stem of control plant; no 

 evidence of thickening of the fibers. Figure 32. Stem of plant given aqueous 

 spray of a-naphthalcneacetamide; fibers have become thick-walled. Figure 33. 

 Stem of plant treated with a-naphthaleneacetamide in lanolin. Figures 34-36. 

 Sixth internodes of hemp. Figure ^54. Stem of control plant; fibers have started 

 to put on thick walls. Figure 35. Stem of plant given aqueous spray of a- 

 naphthaleneacetamide; fibers have become thick-walled. Figure 36. Stem of 

 plant treated with a-naphthaleneacetamide in lanolin; shows greater number 

 and greater thickening of fibers. 



