CONTEXTS 



INTRODUCTION. Page 



Conditions for experimentation 1 



Characterization of animals used 2 



BIOLOGICAL AND NATURALISTIC STUDY. 



Distribution 3 



Description 4 



Seasonal habits 4 



Habitat and feeding 6 



Mability, reproduction and development 6 



Play 9 



Vocalization 10 



QuilHng 11 



Hands and feet 11 



Naturahsts and the porcuj)ine 12 



EXPERIMENTAL DATA. 



Manual dexterity 15 



Reactions to the puzzle-box situations 27 



Form study 42 



Discrimination of color and brightness. . .^ 53 



Discrimination of color following experiments with brightness 59 



Threading maze 64 



Rotation of maze 73 



Dark-room maze experiments 76 



Memory tests 77 



RESUME. 



Conclusion 82 



BIBLIOGRAPHY 83 



