128 PHYSIOLOGICAL BOTANY. 



Growth is a general term for all the processes relating to the permanent 

 enlargement and alterations of various organs. 



Irritability is a term denoting the sensitiveness of any organ to the 

 action of external stimuli. 



CHAPTER II. 



PHYSIOLOGY OF REPRODUCTION. 



Some plants, as the Mume, Daidzu, and Ine, usually 

 reproduce their kinds by seeds ; while other plants, as the 

 Jagafcaraimo and Satoimo, usually reproduce their kinds by 

 separating their subterranean stems. The former process 

 is termed the True Eeproduction, and the latter the Vege- 

 tative Reproduction. 



SUMMARY. 

 True reproduction is a process in wich plants are reproduced by seeds. 

 Vegetative reproduction is a process in which plants are multiplied by the 

 separation of their own parts. 



