EFFECTS PRODUCED BY CUTTING PARAMECIUM CELLS. 57 



leaving the lower part of the peristome, the nucleus and the 

 mouth intact. Twenty-four hours later the truncate cell divided 

 in the plane of the original center into a small truncated anterior 

 fragment (b, c, Fig. 16), and a normal cell (16, d). The abnormal 

 fragment had one contractile vacuole, the normal cell t\\<>. 

 Seventy-two hour- after the original cut the normal cell 

 divided into t\. :ectly normal paramecia. which divided 



again on the following day into normal forms, thus establishing 

 the entirely normal ronditioii of this product of the original 

 truncate fragment. The almormul fragment (c) neither re- 

 generated nor divided for the lir-t live days after the operation, 

 althoii insiderably in size (16, e). < >n this fifth day, 



howe\er, it atteni|)ted todixide, hut cytopla-mir di\i-ion failed 

 and a mon-ter with two mouth-, two contractile vacuole- and 



two blunt ends was formed i ( >. ''/ 1. The power of di\ i-ion seemed 



to : ..red for on the nxth day the ma-- attempted a 



nd di\ i-ion. anl tin- time a perfect Paranicciiini wa- formed, 

 but. as in experiment no. 7. Table I\ .. it could not -eparate from 

 the parent ma and remained attached by a delicate connection 

 throughout life of tin- mon-- . < >n the -e\eiith, 



eighth, and ninth da\ - the mon-ter gradually a unied the in- 

 definite outline- of three paramecia Fig. M>. ;i hut when finally 

 killed on the ninth day tin -e utlim - WC1 in l"-t (j). The 



macronuclei were properly distributed for three indi\ idu.ils bill 



the micioiilK lei Were ilK KM-ed in number, -ix |ierfect oile- being 

 loimd. -eparated h\ c"ii-iderablr di-taii(f from the macronuclei. 

 In expel inn lit no. - s not nl\- \\ere normal indi\ iduals fornn -1 

 but lhe\ were detached and li\e<| for -onie da\ - a- onlinar\ 

 paramecia. Tli> .,etati\e cell \\a- cut in /one II. on 



JanuaiA J s , lea\ing the nucleus, the lower part of the peri-tome 

 and the mouth intact 1 ig. Jo. n, 6). < >n the t \\ cut y-nint h the 

 ti. lament di\ided in the original renter of the cell forming 

 -mall truncated anterior fragment and a normal po-terior cell 

 1 . 2O, r, </ and (). The normal cell, a- in experiment 22 

 above, divided on the following da\ forming normal cell-, and 

 the-e continued to dixide normally on the axerage of once a 

 da\ throughout the life of the other fragment and wen- discarded 

 on death of the latter. The anterior truncate cell (e] grew 



