. [Mil i\K .- 'Mi - ' ! HIPP! >N< '! \V' M' UB \ 



77 



teen contained tin- hook. In late stages it is tin ni.-t conspicuous 

 element of the complex and is therefore quite easily detected 

 when pn-ent; hut when it is not found, one cannot always be 

 sure thai it i- not hidden union- the other chroinoM >me-. In 



mining the eggs then more of tho>e which lacked the hook 

 uould lie rejected as po-iiive r\ idence than of ih<.-e in \\hich it 



nrred, SO I l>elie\e we are -afe in asserting that half of the 



f 



:*'** 

 :: * 





 . * 



- 







19a 19b 20a 

 /. 



20 b 



22 



:. 



/ 



^'ni 



21 a 



23 



24 



21b 



. !;.! .ill. I I -A .lll.il-li.i-.- -Iiii\\ini4 t! 



!': .iii.l 20 i ..ii-pinnm- rlinnn. ..m a l.n.- 



FIGS, a ia ai .' te .m.i|.l. 



I' IGS, .'- - i .Hi. I . P .| .|;iii-lit'T |>l;i(. iK.- 



III. i- .in. \ ' .li.llllrt. 



lertili/ed eggs contain the hook and in half it U al^ent . A- I >r. 

 I 'linen t, 'l l . this journal, ha- -liou n, i In- diniorphi- in in -oinatic 

 chroiiioMiiiu- i;rou|)v i.f fertili/eil Ilipponn,- . ggs an In- associated 

 only \\ith a iliniorphi-in in ihe -perm. 



The deci-ion h.i\in- lu-.n reached as to the differential char- 

 acter o| tin- hoi ik-^h.iped chromosome, the (mention aro-e as to 



