RENDERING RESISTANT STARFISH EGGS NORMAL. 



alkali a> wt-11 asethi-r can o\ ercome the resistance of over-ripe star- 

 ti-h e^-tofertili/ation by their o\\n sperm; also whether treatment 

 \\ith \\eak Dilutions of ether or other lipoid-modifying -ub-tar 

 as \\ell ,t~. with weak alkali, can render en > fcrtili/ati< MI po ible. 

 Thr case of tin . of hermaphrodite animal-, xvhich are irro 

 -pon-i\e i.i -perm from tin- -aim- individual but not t<> that of 

 other individual-. may po--ibly belon- in p. in to the prc-eiit 

 \ Morgan 1 found that tin- < ggs >f (';<>;/./, which furni-h 

 a typii al in -tame of tin- beha\ i<>r. could be lertili/ed b\ -perma- 

 IO/.M from the -aim- individual in \\eak -olution^ of ether, ani- 



inoni.i .,r ali <.ho| ; but he is inclined to attribute th< to tin- 



-liinulatin'< action of the-e -ub-tanct - on tin- -perm, rather than 



to an alteration of tl In one experiment, however p. 147 . 



in \\hich the -permato/.i.i alone \\ere treated \\ith ether before 

 adding t" Hi' tertili/ed. \\hile \\heii both . 



and -perm \'. treated the percentage . if fenili/ati"ii \\a- 



hi'^h in om -5 per cent, a- c.nnpared \\ith 4 ; 



I'hi- ( \]ietimeiit -i; that the ether produce- it- effecl not 



mereh by increa-in^ the motility nt tin- -perm, but al-<> b\- 

 altering the t ondition .,) the egg, as in tin ' An- 



other intere-tiiu : n \\hich the rendered refractoiA tn 



;ili/ati"ii ha- r.-ieiitU been de-i ribed b\ (.odle\\-l If the 



-permato/.M ..i > ; iidoi - ruts are mixed, both 



are toliml alter a le\s- minute- to ha\e iiUll|ileU-|\ lo-l the po\\er 



o| lertili/in^ tin Eggs left < \poM-d t' thi- 



M organ , . > . 



/i i. \'..l. u. p. . 



1 Tin- -|-i : n>tilily in -; li.ivinn 



kin.u ii tin- iimtility un.! mly tli> 



i i~ nioililic'! l iiii-inliiaii"-l\ -in- t" tin- 



."llld illl|i!>- liri^lltdl' 



inrinl'i.iin- ol ili-- -i--i!!. 



I iiintik 1 .ii'tivity (. :hytliin in ti 



liilit> ;uiil |)"l.u. nilitiiiiiim; tin- umvciin-i:: -. Vari 



in nciiii.il iritili/.itin t! mutually 



in a ~.'iii'-\\h.it -iinilar inanin-r. .in<l that a i-yt-'lyt: ibility-ii. 



I liy tin- ri;v; ii|i"ii tin' -IM-IIII ,i- \\'-!l a- liy -|-!in U] 



Thu-i tlu- -pi-i in u-ually . iiiiivrnit-nt* -"ii a: j ..'t with ami 



i.ltrn nnly a p.irtion i-ntrrs the latt< lytic or <li-intri;rati . tin- 



thiH iiiiluati-l. Tli<- I'la-ina iiiciiihram- ni t m iniuht as 



apparently in (ioilk-\v-ki'- 'Xp'-riim-. ;itly hy; --.ant 



to prcvi-nl l\\\< mutual (.-ytnlytic action without entir i motility. 



