122 



Page. 



Table of reactiun-times at différent températures. 



The influence of température on the reaction- 



time. Czapek and Bach. 



The influence of stimulation-time on the reac- 



tion-time. Czapek and Bach. 



CHAPTER m. DISCUSSION OF RESULTS . . 64 

 § 11. Comparison of the results with those 



ofprevious investigations 64 



The figures of Czapek and Bach. 



The experiments of H aberl and t and Darwin. 

 § 12. Van 't Hoff's law 66 



The process of which the reaction-velocity has 



been determined. 



This investigation confirms B 1 a c k m a n's theory. 



The température-coefficient for the presenta- 



tion-time. 



Discussion regarding the nature of theperception- 



process. 

 § 13. Optimum and time-factor 69 



Blackman's views on the subject. 



The favourable and the harmful influence of 



high températures as time-functions. 



Explanation of the curves on plate III. 

 § 14. Limiting factors 76 



What are limiting factors ? 



Czapek's curve for the presentation-time at 



varions températures and the results of the 



présent investigation from this point of view. 



The presentation-time at 0° Centigrade. 

 § 15. The investigation of van Iterson and 



MissvanAmstel 78 



Summary of the investigation. 



Validity of van 't Hoffs law in v'dro. 



