PLANT PHYSIOLOGY 



really merge into one another. Physics is linked to biology by 

 biophysics, and biology is connected by history and political 

 science with psychology. But physics is also related to psychology 

 through logic and mathematics, so that instead of representing 

 the fields of knowledge by a spectrum, it would be better to use a 

 color triangle as suggested by Newton (Fig. 1). In such a triangle 

 we can place every known field of knowledge. Music stands be- 

 tween physics and psychology since this latter includes the group 

 of studies which deals with ideas, emotions, and feelings. Geology 

 is between physics and biology; while astronomy is not far from 

 geology, physics, and mathematics. In the center, occupying the 

 place of white light, which is the synthesis of all, stand meta- 

 physics and philosophy, which deal with the nature of thought. 



Place of Physiology. — Where does physiology appear in such a 

 scheme? Physiology is not one subject but a synthesis of sub- 



Biology 



/ 



/Biochemistry. 



/ 



Geology 



History 



\ Realm of 



Physiology 



/ Chemistry 



/ 



/ Physical 



/ Chemistry 



Physics 



\ 



Astronomy 

 Music 



Psychology 



Fig. 1. — Illustrating the relation of the sciences to each other. (After 



Whetham.) 



jects which deals with the behavior of organisms, and as such it 

 includes parts of biology, chemistry, physics, and geology. It 

 is thus a region and has been indicated (Fig. 1) by the dotted line. 

 Since physiology is so inclusive it requires a broader background of 



