PLATE 3 



EXPLANATION OF FIGURES 



24 to 34 First spermatocyte divisions 



24 a ^letaphase spindle, projecting arm toward left pole. 



24 b Equatorial plate, projecting arms. 



25 a Equatorial plate, no possible A'-chromosome. 



25 b and c Equatorial plates, mass of chromosomes in two pieces. 



26 a Equatorial plate, round chromosome to right. 



26 b Metaphase spindle, three-parted chromosome toward upper pole. 



27 Equatorial plate, two separate round chromosomes. 



28 a ^Metaphase spindle with round chromosome to the right, and an arm to 

 the left. 



28 b ]VIetaphase spindle, one small round chromosome to left. 



28 c Equatorial plate, three separate round chromosomes. 



29 Metaphase spindle, corresponding projecting arms to the right toward 

 each pole. 



30 and 31 iVIetaphase spindle, one round chromosome toward lower pole. 



32 Metaphase spindle, projecting arm toward upper pole, and round chromo- 

 some toward lower. 



33 Metaphase spindle, F-shaped chromosome to right. 



34 Anaphase, projecting rod-like arm only at lower pole. 



35 to 37 Second sperttiatocyte divisions 



35 a Metaphase spindle, no possible A-chromosome. 



35 b Anaphase, no possible A'-chromosome. 



36 a and d Equatorial plates, out of focus. 



36 c and e Equatorial plates, no possible A-chromosome. 



36 b Anaphase, no possible A-chromosome. 



37 a and c Equatorial plates, out of focus. 



37 b Metaphase spindle, no possible X-chromosome. 



37 d Equatorial plate, round chromosom'e toward upper side. 



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