AS THE BIOLOGIST SEES IT 



non-existent. Color is color to us and 

 sound sound only after a mental percep 

 tion. But the different ether waves which 

 are perceived by us as color and the 

 atmospheric waves as sound might per 

 fectly imaginably go on coursing through 

 the ether and atmosphere although no 

 human or animal sense-organs and brains 

 perceived them. In fact the physicist 

 is quite sure they would. If a photo 

 graphic plate got in the way of the light 

 waves and a phonographic plate in the 

 way of the sound waves the existence of 

 these waves would be mechanically reg 

 istered. 



In Stanford University a number of 

 years ago I used to walk down an avenue 

 lined with trees I believe they were 

 trees to the beautiful quadrangle of 

 buildings, with a companion, now a 

 distinguished professor of philosophy in 

 an important Eastern university, who 

 proved during our walk each morning 

 by what was to me a verbally irrefutable 

 logical argument that there were no trees 



