I OBJECT AND SCOPE OF PHILOSOPHY 59 



may be called knowledge. Nor can the second 

 problem be dealt with in any other fashion ; for it 

 is only by the observation of the growth of know- 

 ledge that we can rationally hope to discover how 

 knowledge grows. But the solution of the third 

 problem simply involves the discussion of the 

 data obtained by the investigation of the foregoing 

 two. 



Thus, in order to answer three out of the four 

 subordinate questions into which What can I 

 know ? breaks up, we must have recourse to that 

 investigation of mental phenomena, the results of 

 which are embodied in the science of psychology. 



Psychology is a part of the science of life or 

 biology, which differs from the other branches of 

 that science, merely in so far as it deals with the 

 psychical, instead of the physical, phenomena of 

 life. 



As there is an anatomy of the body, so there is 

 an anatomy of the mind ; the psychologist dissects 

 mental phenomena into elementary states of con- 

 sciousness, as the anatomist resolves limbs into 

 tissues, and tissues into cells. The one traces the 

 development of complex organs from simple rudi- 

 ments ; the other follows the building up of com- 

 plex conceptions out of simpler constituents of 

 thought. As the physiologist inquires into the 

 way in which the so-called " functions " of the 

 body are performed, so the psychologist studies 

 the so-called " faculties " of the mind. Even a 



