PSYCHOLOGY, 55 



a commercial value that placed its dissemination 

 largely in the hands of men who knew more about 

 examining heads and collecting fees than they did 

 of mental philosophy or the physiology of the 

 brain. 



Physiological psychology is defined by Prof. 

 Ladd as : "The science of the phenomena of the 

 human consciousness in their relations to 

 structure and functions of the nervous system. 

 It is psychology because it is the science of the 

 human mind, or soul ; it is physiological psychol- 

 ogy because it regards the mind as standing in 

 peculiar relations to the - bodily mechanism. It 

 attempts to bring the two orders of phenomena, 

 those called mental and those belonging to the 

 nervous system, face to face. It considers them 

 as mutually related. It endeavors, as far as pos- 

 sible, to unite them in terms of a uniform char- 

 acter, under law. Its method is to explain the 

 phenomena of man's sentient life as correlated 

 with the life and growth and action, under stimuli, 

 of his nervous system." 



Physiological psychology deals exclusively 

 with the relation of nerve function to sensation 

 and mental phenomena. It ha* to do with the last F ^ n of Investi ~ 

 series of physical phenomena before we pass into 

 the realm of purely psychic phenomena. It con- 

 siders the stream of consciousness the manifest 

 function of the brain ; or that the psychic life con- 

 sists of a series of conscious states connected with 

 physical states that begin with sensation and end 

 with action. According to Francis Galton, "The 



field of physiological psychology embraces' 



a t . j A -i j r Views of Galton, 



reflex action and instincts ; detailed study of sen- 



