IIKOMOSOMES OF HIPPONOE AND MOIKA. I 71 



thickness of the chromo-ome- which i> a -pecitie character. 

 Figs. la, ib and 25 show equatorial plates of Hipponoc and Moiru 

 re-pectively, and \<y comparing them one sees that the Hipponoc 

 r<d- are thicker than those of Mira. It may 1 >e thai the spindle 

 radiu.- i- le in Hipponoc than in other form-. A;.:ain an attrac- 

 tive force may e\i-t among the element- of one daughter i;n>up 

 and ihi- nii-ht cause clumph.- 



Tht-n- are main reasons why the anapha>e stages are nio-t 

 lav orable t'or -tndie- of ihi- -ort lmt there i- no doul't that much 

 < an I"- g iiiH-d from a -unl\- of etjiiatoria! plate-. A- \\ill U- -eeii 

 from tin- figures n-S-rn-d to, ihe p^lar views of metapha-e Stag* - 

 are iii.ilU- \<>r determining the relatixe thickiu of 



the chroiii<i-oinc~. although a- 'I'emu-nt. '07, ha- pointed out, the 

 contrast i enough tn ju-tify tin- i-\clu~i\<- u-e of 



i hi- (ha racier as a mean- of distinguishing between the clm>mo- 

 somes of two in h\ Nrid-. Tl ts of the i ontracted 



spireiin- in metaphaS4 have not \-i lu-i-n inlluenced 1>\ the 

 >pindle iil'i-r- or the fora \\hii-h produce- .li\i-iou. whatever 



thai ina\ be, and th' i uniform thickne--. ^nch 



i (|uaioij,il p! iposed i--h iped chromosomes oi 



\ai\in. 'i- I'lieN in.i\ IM i. cur\i-d urexwn lieiil at 



\ai'iou- angl( In tin- lait-- ii . "iild not l.c deiermined 



\\hellier ihr resulting \'-like i hroiil- >-o!in-- uere to lie iddllillid 

 uilh tin \ '- toimd in tin- di\i-ioii si \< iilu r i- it p"--il>le 



to del ermine ihe 1 1 ngth or it i in ; the rod-. ( 'loudinv^ and 



'\ eilapjiiir^ in -ouie parts "I th jilale pre\eiit- the -eparatinn 



ot ihe element- Of theil . mea-lirelllen t . It llo\\ < \ el" t he 



cliromo-. une- maintain ci'ii-iaiit -i/e relation-, a- u>- -Imuld \- 

 peci fnnu the alum-lam e > ! e\ id. ( nee .in thi- point gained from 

 lorm^ m're -uilalile fo-- ii- <!em. 'ii-t rat ion. and since, as I have 

 >ho\\ n in my li^un -. the thick; i!n r-d- in thi- Stage i- 



- 1. m l . it ^eem- that the n lati 'h- of t he chnuno-. ,nn - at 



(hi- mu-t l-e c.Mi-tant al-o and that in the -ul>-ei|ueni 



di\i-ic,n si the thick I the p>d- does e\i<lenil\ 



\ai\ the l-'iuih relation- Jso. Thi- I c.m-ider .1 ]ioint of 



l^reat import. nice since i: i- <>n ju-t -uch a compari-on of ihe 

 len-th- of the chroino-ome- in di\'i-i.-n Stages thai lialt/er. "lO, 

 <le|>end- for much of hi- evidence as to the identity of ihe elimi- 



