98 ANIMAL ECOLOGY 



wickelungsmechanik der Organismen (Roux), Bd. 

 XVII, pp. 265-305. 

 1907. Regeneration as Functional Adjustment. Jour. Exp. 



Zool., Vol. IV, pp. 419-430. 

 WILSON, E. B. 



1905. The Problem of Development. Science, N. S., Vol. 



XXI, pp. 281-294. 

 SHERRINGTON, C. S. 



1906. The Integrative Action of the Nervous System, pp. 



411. New York. 



The activity of the nervous system is viewed as a 

 regulatory process. 



The similar responses to diverse stimuli or the 

 similar results produced by diverse causes are the 

 conditions which make an analysis and the isolation 

 of causes necessary. With departures from the nor- 

 mal and optimum into zones of stimulation and of 

 unfavorable conditions many similar effects or results 

 are produced. The similar results of extremes of 

 high and low temperature as shown in Fischer's 

 experiments on Lepidoptera, and the effects of high 

 temperatures, aridity, and the lack of oxygen may 

 be cited as examples. Such effects have an im- 

 portant bearing upon the subject of physical and 

 chemical limiting factors which influence individuals, 

 * aggregations, and associations. 



BLACKMAN, F. F. 



1905. Optima and Limiting Factors. Ann. of Bot., Vol. 



XIX, pp. 281-295. 



"When a process is conditioned as to its rapidity by a 

 number of separate factors, the rate of the process 

 is limited by the pace of the 'slowest' factor." p. 289. 



