710 KAYMOND PEARL. 



done repoudi'e iion seulementj ' Je I'ignore/ mais encore, 

 ' Pen m'iniporte ' ! " With this standpoint I am in thorough 

 accord. 



H. List of Literature. 



Bakdeen, C. R. : 01. — "On the Physiology of llie Planaria niaculata, 



with Especial Reference to the Piienonieiia of Regeneration," ' Anier. 



Jouin. Plivsiol.,' vol. v, pp. 1 — 55. 

 Bardeen, C. R. : 01, r/. — "The Function of the Brain in Planaria 



maculata," ibid., vol. v, pp. 175 — 179. 

 Chichkoff, G. D. '02. — " Recherches sur les Deiidrocoeles d'eau douce 



(Triclades)," ' Arcli. de Biol.,' t. xii, pp. 435 — 568, pis. xv — xx. 

 Child, C. M. : 01. — "Tlie Habits and Natural History of Stichostemma," 



'Amer. Nat.,' vol. xxxv, pp. 975—1006. 

 Claparede, E. : 01. — " Les Animaux soiit-ils Conscients ? " ' Rev. Philos.,' 



t. li, pp. 481—498. 

 DuYNE, J. VAN. '96. — " Ueber die Heteroniorphose bei Phuiarien,"' ' Arch. 



f. d. ges. Physiol.,' Bd. Ixiv, pp. 569 — 574, pi. x. 

 Frandsen, P. :01. — "Studies on the Reactions of Limax maximusto 



Directive Stimuli," ' Proc. Anier. Acad. Arts and Sci.,' vol. xxxvii, pp. 



185-227. 

 Gamble, F. W. '93. — " Contributions to a Knowledge of British Marine 



Turbellaria," 'Quart. Journ. Micr. Sci.,' vol. xxxiv, ])p. 433 — 528, 



pis. xxxix — xli. 

 Hesse, R. '97. — "Untersuchungen iiber die Organe der Lichtempfindung 



bei niederen Thieren : II, Die Augen der Plathelniinthen, insondcrhcit 



der tricladen Turbellarien," 'Zeitschr. f, wiss. Zool.,' Bd. Ixii, pp. 527 — 



582, Taf. xxvii and xxviii. 

 Jennings, II. S. '97. — "Studies on Reactions to Stimuli in Unicellular 



Organisms: I, Reactions to Chemical, Osmotic, and Mechanical Stimuli 



in the Ciliate Infusoria," 'Journ. Physiol.,' vol, xxi, pp. 259 — 322. 

 Jennings, H. S. '99. — "Sludies on Reactions to Stimuli in Unicellular 



Organisms : II, The Mechanism of the Motor Reactions of Paramecium," 



' Amer. Journ. Physiol.,' vol. ii, pp. 311 — 341. 

 Jennings, H, S. '99, a. — " Studies on Reactions to Stimuli in Unicellular 



Organisms: III, Reactions to Localised Stimuli in Spiiostomum and 



Stentor," ' Amer. Nat.,' vol. xxxiii, pp. 373—389. 

 Jennings, II. S. '99, Zi. — "Studies on Reactions to Stimuli in Unicellular 



Organisms : IV, Laws of Chemotaxis in Paramecium," 'Amer. Journ. 



Physiol.,' vol. ii, pp. 355—379. 



