THE REACTIONS OF iEOLOSOMA TO CHEMICAL 



STIMULI 



BY 



H. G. KRIBS 



With Two Figures 



Introduction 43 



Natural history of aeolosoma 45 



General Morphology 45 



Movements and reactions in a state of nature 46 



Summary 51 



The action system 51 



The physiological states 52 



Material for the experiments 53 



Reactions to chemical stimuli 54 



Methods 54 



Threshold stimuli 56 



Toxicity of stimuli 57 



Nervous system and stimuli 58 



Effect of changes in the ambient medium on the reactions 59 



Normal stimuli 60 



Reactions under uniform conditions 60 



Reactions under changing conditions 62 



Strong stimuli 63 



Reactions under uniform conditions 63 



Reactions under changing conditions 65 



Summary of results of the experiments 65 



Conclusions 67 



Bibliography 73 



INTRODUCTION 



The object of this paper is to consider the movements and 

 reactions of iEolosoma under definite conditions of control, as a 

 contribution leading toward an analysis of the nature of its be- 

 havior. 



^olosoma is able to move about freely in the ambient medium. 

 The energy which finds expression in the performance of these 



The Journal of Experimental Zoology, vol. viii, no. i. 



