8 THE STORY OF PLANT LIFE 



shadowed by other movements that operate in a 

 different manner. 



Collaterally with all such movements there is, of 

 course, the effect of growth in length, caused primarily 

 by the influx of new food materials, the passage of 

 these to the growing point, the rapid division there 

 of undifferentiated cells, and their subsequent forma- 

 tion into complex cell-layers and tissues. Growth 

 is a process of elongation, vertically and horizontally, 

 as a result of the elaboration of organic substances 

 in the plant body, and its consequent accessions of 

 new formed cells or tissues at every extremity where 

 a growing point is established. 



Movement is primarily due to certain sense per- 

 ceptions that plants possess. 



Jung stated, with regard to the idea that plants 

 possess consciousness, " Planta est corpus vivens non 

 sentiens.'" Linnaeus said: "Minerals grow; plants 

 grow and live; animals grow, live and feel." Un- 

 doubtedly there is a certain kind of parallelism 

 between the characteristics of plants and animals, 

 especially noticeable in the lower grades of each, in 

 so much that there are many lowly organisms which 

 are regarded as plants by some observers and as 

 animals by others, it being extremely difficult to 

 determine what is the difference between a plant and 

 an animal. Opinions upon this point to-day are, 

 indeed, still unsettled. The Mycetozoa are an in- 

 stance of this. They are placed in the plant kingdom 

 on account of their mode of reproduction and 



