The Journal of 

 Comparative Neurology and Psychology 



Volume XIV 1904 Number 6 



THE BEHAVIOR OF PARAMECIUM. ADDITIONAL 

 FEATURES AND GENERAL RELATIONS. 



Hv H. S. Jl'.NNlNGS. 



.lisiititut Prn/i-swr of Zoology in tJn: ("/ti:'rrsi/y of P.iiiKy/rutnin. 



H'itlj 17 lisurcs ill iIh' text. 



CONTKNTS. 



INTRODI'CIION : Object and Methods ..... )i- 442 



I. The .A.CTION Svstk.m p. 443 



I- The Usual Movements ; Spiral Swiiniiiing, p. 443. 

 2. Modification of the Movements under Stimulation ; 

 Reaction Types, p. 450. 3. The Avoiding Reaction, 

 p. 450. 4. The .Avoiding Reaction as a Factor in Be- 

 havior ; the Method of 'I'rij.l and Error, p. 45S 



II. Nature OF Stimulation .p. 464 



III. Reactions to Certain Sitmui.i, with special Refer- 

 ence TO THE Part Played by the Action System . . p. ^68 



A. Reactions Produced throngh tlie '■^ Avoiditig Reaction.'''' p. 4(18 



I. Reactions to Water-Currents; Rhcotaxis, p. 46S. 2. 

 Reactions to (iravity ; Geotaxis, p. 473. Sunimarv, p. 479. 

 H. Behavior during Conjugation. . . j). 4.S0 



C. Responses to Stimuli tiot Brought ahout through the 

 '■^ Avoiding Reaction."' ........ p. 4S ; 



1. I'orward Movement as a Response to Stim- 

 ulation. ....... p. 4S3 



2. Reaction to Klectricily .... p. 4S4 



J'art played by the .\ction System, p. 

 4S4. Peculiarity of the Reaction to Elec- 

 tric Current, p. 488. Cause of Rackward 

 Swimming in Strong Currents, p. 494. Re- 

 lation between Contact Reaction aiad Re- 

 iiction to Electric Current, p. 496. Irreg- 

 ularities of Reaction to the Electric Cur- 

 rent, p. 503. Reaction of Paramecia to 

 Electricity when in solutions of Chemicals, 

 ]). 504. 



IV. Present Position ok Investkjation of the Behavior 



OF Pakamecum ......... p. 5or» 



