PREDETERMINATION OF SEX 



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beginning of the growth period, as shown in diagram 3, a, b, c, 

 and the threads later condense at one side of the nucleus, as 

 shown in d. No details of the process of union of the chromo- 

 somes, that must take place at this time, can with certainty be 

 made out. The figures are as accurately drawn as possible, but 



Diagram 2 a, prophase of an oogonial division; b, metaphase of an oogonial 

 division with six chromosomes; c, young parthenogenetic ovum just prior to the 

 appearance of the chromosomal filaments shown in d, e, f, young ova for the 

 most part in the lower end of the ovary or else just out of the ovary, showing 

 six chromosomes whenever all of the chromosomes are included in the section. 



beyond the fact that the chromosomes are condensing, the in- 

 terpretation of the details of the drawings is unsafe. Wlien the 

 chromosomes begin to emerge from the condensed stage, as seen 

 in diagram 3, e, f, g, h, three clumps or rods, or sometimes open 



