EFFECTS PRODUCED BY CUTTING PARAMECIUM CELLS. 63 



abnormal nucleus-protoplasm relation in a normal vegetati\e 

 tell, cannot exi-r. Waiving this verbal matter. however, and 

 e\ iminiiig the principle involved, \ve admit the change in the 

 relative masses of nm leu- and cytoplasm in periods of gn>\vth. 

 As to the gro\\ t h of the nucleus prior to cell division the evidence 

 i- not -o clear. In I'nniychia transfua at division, for example. 

 Hot only i- ihe ' i -lirface of the nuclear element- lc etled 



Imt the mass as well is decreased, and the two -mall cells resulting 

 from the divi-ion <oin.iin -mall nuclei which -ub-e(|Uently 

 break up into fragment- before growth commence- and with 

 -i"\\ th there i- a constantly increasing -ur face of nuclear matter 

 1 ilkin-, 'll . On the Hertuig theory u e -hould expect a 

 re-iii ution b\ divi-ion, of tin- "normal" ma-- relation- in 

 flagmen!- of idl- containing cither a preponderance of nuclear 

 matter or of t \ topla-mit . I igi < oi cell-. ho\\e\ cr. -ho\\ 

 no -inh regulator} ; . for tutting th- fell- iiixariably 



po-tpoiic- di\i-ion mile-- the di\i-ion i- already undi-r \\a\. 

 I ndci abnormal t oin lit idi- of temperature Pop. iff find- that 

 the volume i,f the niulcii- i' - more rapidly than that o| 



the c\topla-m. \arioii- observers ha\e noieil that under ab- 

 normal i < -in lit ion-, geiieialK . it u I u< ling t hat of \\ <-akt net 1 \ itality 

 tioin .m\ cause, the mil leu- i- relali\c-l\ larger than under 

 normal condition^ and the enlai Cement i- bi-tter interpreted 

 as an ellcct o| lc--cin-d \italit\ than ii- an-. . p. .poll liki-\\i-e 

 |>ci!oiincd i lilting cxpciimcin- "ii l-'<<nitnnin . and louinl. a- 



lialbiaiii ami other- ha\e loimd. that the cell, it cut late in an 

 inter-tli\ i-ional period. di\ ide- in the original plane of <li\i-ioii. 



lint if the cdl i- cut i hi- period the cell tir-t regenerates 



before di\ iding. 1 le t oiu ludt - " 1 >!. 56 \ < T-IH h /eigeil, da tier 

 AnstOSSgebende Moment d-r rheilung in dein . \iigeiiblit k der 



Kernplasmaspannung /u -m hen i-t. ^o \\ie die /.die die-en 



M.-ment uber-t hrit ten hat. i-t der Teilung dci-elben -choii cinge- 

 leitet und kein ausserei I ingrill kann -ie mehr \erhindcrn" 



'08, p J37). It i- tlitfit nli this conclusion from the facts 



pre-cntcd ami -till nu>re dilticult to interpret Mich ca-e- a- my 

 experiment U), Table III., \\here t \\ SUCCCSSlve di\ i-ion- of a 

 fragment were entire!) a-\ mmct rir.d SCCp. 52 . Inthi-ta-e 

 furthermore there \\a- a long period bet \\eeii di\ i-ion- \\hen 



