2 THE STORY OF PLANT LIFE 



term morphology, but this really does more than take 

 into account their form, and comprises also their 

 internal structure, the relation of one part to another, 

 together with the change which is undergone as the 

 plant develops or is modified in response to environ- 

 ment, etc. Anatomy and histology are branches of 

 morphology. 



Anatomy, a term more familiar to the zoologist, is 

 concerned especially with the structure of plants, 

 internal as well as external. It deals with the parts 

 of the members of which morphology treats. Thus, 

 cross-sections are the study of the anatomist. Com- 

 parative anatomy enables one to determine the 

 relationship between different forms. Cytology deals 

 with the study of the cell, histology with that of the 

 tissues. 



Physiology deals with the work done by the plant, 

 its activities, and the interpretation or relation of 

 form or structure to function. Physiology is essen- 

 tially an experimental branch of botany, and inquires 

 into the functions of nutrition, growth and move- 

 ment. 



Systematic Botany is the study of the characters of 

 different plants, their classification and arrangement, 

 based largely upon external form. An endeavour is 

 made to ascertain by aid of it the relationship of one 

 group to another, or their affinity. This is denoted 

 by the study of phylogeny, which also seeks to ascer- 

 tain the origin or derivation of one type from 

 another. 



