570 ETHNOLOGY 



clan and clan, tribe and tribe, nation and nation, is that form of ecology which 

 is more generally known under the name of economics and politics. 



Finally we have the attempt at an evolutionary interpretation of all human 

 history, or ethnological etiology. 



Psychology 



A third plane of the study of man is one in which the limitations of the class- 

 ification in the animal plane are largely transcended. Anthropography deals 

 with man solely as an animal; ethnology, or sociology, studies all the enterprises 

 of social man. Psychology takes us into the inner sanctuary of man, and while it, 

 too, has its roots in his animal nature, it flowers, so to speak, hi a realm of its 

 own. 



The physiology of the senses passes through psychophysics into psychology 

 proper. Sensations and mental operations can be analyzed and classified; their 

 genesis can be studied partly by observation, partly by inference. 



Objects made by man may be studied concretely; the uses to which they are 

 put in the individual or social life can be described; but there is also a psycho- 

 logy of invention, a psychology of social function, a psychology of language. 



The psychology of the individual, and the comparative psychology of groups, 

 are both subjects for study. Thus we arrive at the psychology of economics 

 and politics: but have we not already passed beyond the legitimate bounds of 

 OUT science? 



