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IOWA ACADEMY OF SCIENCE 
Figures 24 and 25. Resting nuclei in root tip of Zea Mays. 
Figures 27, 28, 29 and 32. Continuous spireme. 
Figures 26, 30 and 31. Formation of 16 chromosomes. 
Figures 33 and 34. Early prophase, showing hyaline areas containing 
centrosomes. 
Figures 35 and 36. Early formation of spindle before disappearance of 
nuclpar membrane. Rare and abnormal. 
Figure 37. An abnormal spindle in which chromosomes fail to assume the 
typical V-shaped form. 
Figure 38. Typical mother star. 
