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GARY N. CALKINS 



of the spindle. The number of rods is four but each rod is 

 double. How these double chromosomes are formed from the 

 eight single ones I am unable to decide. Another, and a less fre- 

 quent stage, is illustrated in figure 55, c. Here there are eight 



Fig. 48 First maturation spindles, second type, with definite nuclear plates. 

 X 800. 



Fig. 49 Pair in prophase stage of first maturation division, with degenerating 

 parachute nuclei. X 800. 



Figs. 50 to 53 Division of granular mass of chromatin in degeneration of first 

 maturation nuclei into two parts, and vesicular swelling of the nuclear membrane. 

 X 3200. 



distinct chromosomes arranged in groups of four. If the former 

 stage is a metaphase, is the latter an anaphase or a prophase 

 stage subsequent to that shown in figure 54, rf? In no case found 

 do the chromosomes lie with their long axes at right angles to the 



