CONTENTS 

 Part I. Contact Values in Locomotion page 



A. Introduction 7 



B. Historical 7 



C. General Description of Problem 13 



D. Apparatus 1^ 



E. Mode of Experimentation 15 



F. The Learning Curve 15 



G. Experimentation 17 



Experiment I. Normal Rats on Maze with Sides 17 



Experiment II. Normal Rats on Maze without Sides 18 



Experiment III. Rats without Vibrissae on Maze 21 



Experiment IV. Rats with Vibrissae Cut on the Right Side 23 



Experiment V. Rats w-ith Vibrissae Cut on Left Side 23 



Experiment VI. Anosmic Rats with and without Vibrissae 30 



Experiment VII. Rats with Sensory Nerve to Vibrissae Cut 30 



Experiment VIII. Blind Rats with Vibrissae 32 



Experiment IX. Blind Rats without Vibrissae 35 



H. Summary of Labyrinth Experiments with Conclusions 38 



I. The Sense of Equilibrium 41 



J. Appendix 47 



Part II. Tactual Discrimination 



Division I. Experimentation 



A. Description of Apparatus 53 



B. General Conduct of Experimentation 54 



C. General Behavior of Animals in the First Series 56 



D. General Behavior of the Animals in the Second Series 59 



E. Records of Experiments of First Series 61 



F. Discussion of the Results of the Experiments of the First Series . 61 



(a) Rats with Vibrissae 61 



(b) Rats without Vibrissae 61 



(c) Anosmic Rats 61 



G. Records of the Experiments of the Second Series 63 



H. Report of Special Behavior of Animals of the Second Series 63 



(a) Rats with Infraorbital Nerve Cut 63 



(b) BUnd Group 65 



(c) Normal Group 68 



I. Summary 69 



Division II. General Discussion 



A. The Advantage of the Use of the Contact Senses in such Experiments .... 70 



B. The Sense of Familiarity 72 



C. The Emotional Element 74 



D. Association and Discrimination 76 



