EFFECTS PRODUCED BY CUTTING PARAMECIUM CELLS. 55 



merit was very lively for 72 hours growing enormously during 

 that period (Fig. 14, b). Between the third and the fifth day it 

 divided giving ri-e to a monster as shown in Fig. 14, c. The 

 mass had two peristomes and two mouths placed as shown in the 

 figure, and continued to grow in size changing form from day to 

 day and adding a new mouth on the sixteenth day. It died on 

 tin- -e\eiiteenth day. Tin.- nuclear apparatus had disintegrated 

 with death of tin- ma-- and could not be determined. Thi- < ase 

 gave th>- lar^i -' mass of protoplasm obtained, with tin- tc\\e-t 

 cell organ-, only one i mt Tactile vacuole being O!>MT\ -d and \\ ith 

 onl\ two mouth- for mo-t of the linn-. The power to gro\\ was 

 intai i and the in . at enough for -i\ cell-. 



No. 17 Table 1 1 1. is another simple case of monster formation 

 \\hiili dillered from the foregoing in appearing after the lir-t 

 di\i-i"ii -ub-ei|iieiii to the operation. The cell wa- cut in /one 

 III. a- -ho\\ n in Fig l -. :. < n l he foil- >\\ing day the fragment 

 had di\ided inio ,m abiionnal and a normal cell (b, C, </). < >n 

 the -et ..lid da\ the normal cell di\ ided \\ hile the abnormal one 

 remained as b - gn>\\ ih. < >n the third da y the normal 



cell dixiiled once .uain into i \\ o normal celU, and the abnormal 

 One attempted to divide bin formed a nion-ter with a -mall 



anterior and a larger pi portion. There were two mouths, 



t\\o peri-tome- and l \\ o coinraciile \acnole-. ( >n the tourth 

 <la\ the mon-ier had changed -ome\\hat in axial relation- so 

 that the form- ol t \\ o paraiin . ia coiil-1 be ma-le mit. The mass 

 lio\\e\er \\a- ue.iker than on the |)reci-din- day and died on the 

 follouin;^ tilth' da\. A ] >re] laralion >ho\\ed the pre-eiice o| 

 t\\o macroiuiclei and t\\o micronuclei in their a|)propriati- po-i- 

 tion- Fig. [5, 



|-".\|terimellt 40 Table II. ;^a\e one of the I)lo-t illtere-tillg 



of the monsters Ph< cell was cut in /one II. on the fourth of 



February. Fori \-eight hour- later it hail attempted to ilixide 

 in tin- original center of the cell but formed a nion-ter with a 

 -mall anterior cell and a full >i/e posterior cell Fig. 17, a and 6). 

 T\\o complete peri-tome- uith mouth- were piv-ent and two 

 contractile vacuoles. The-e condition- \\ere retained \\ithout 

 further morphological change >a\ e growth in size until Feb- 

 ruar\ lo. or the -i\th da\ , \\ hen a drop of nuclei n was added to 



