THE MANIFESTATIONS OF LIFE 71 



the various parts of the organism. Among these highly 

 specialized conducting tissues we find terminal endings 

 by which the impulses or stimuli are received, fibres by 

 which they are transmitted, and ganglionic cells by which 

 they are received and systematically redistributed, fibres 

 by which the new impusles are further transmitted, and 

 finally nervous terminations by which the final stimuli 

 are imparted to the particular cell groups for which they 

 are intended. 



MOTION. 



Motion and locomotion are widespread vital manifes- 

 tations, and are among those for which we first seek in 

 endeavoring to decide whether or not some newly dis- 

 covered object is living or not Iving. If it move through 

 activities resident within itself, we are satisfied that it is 

 alive, but if through obedience to. external forces, further 

 investigation of its properties and consideration of its 

 other manifestations become necessary. 



It is taught by some biologists that some movement 

 is to be found in every living thing, but it has already 

 been pointed out that life exists in both active or kinetic 

 and latent or potential forms and that what applies to 

 the former may not apply to the latter. While, there- 

 fore, it is quite true that some form of motion exists in 

 all active life, it is difficult to imagine it in such latent 

 forms of life as the spores of fungi and the dry seeds of 

 plants. 



Motion and locomotion must not be confused. Many 

 living things are in constant motion, to which locomotion 

 is impossible. 



One must also avoid the hasty conclusion that no 

 movement is in progress because none can be seen. In 

 reality the motion that can be seen is greatly outweighed 

 in importance by the motion that cannot be seen. Thus 

 one sits quietly in a chair for a time, then rising, takes a 

 turn about the room and reseats himself. To the un- 

 informed, it may appear as if the only movements made 



