THE OPENING OF THE BUDS, CONTINUED 



53 



method, — that of homology, or the comparison with 

 structures in other plants which give evidence of 

 having had a similar origin. • 



Pig. 52. 

 Rhododendron flower-bud. 



53o. Morphology (literally the science o( forms) is used to denote 

 the study of the different forms which any part assumes, and the 

 relationships of parts or members of plants (and of animals) to 

 each other. It inquires into the origin and method of develop- 

 ment of a leaf or a root, and endeavors to determine how that 

 part' is related to other parts, and to an assumed ideal type. 



536. Homology is the consideration of the origin of parts with 

 reference to each other. It implies genealogical relationship. Homol- 

 ogous parts or organs are those which have similar structural relations 

 to a given or fundamental type, or those which have evidently had 

 similar origins in the development of the plant or the animal. 



53c. Analogy is similarity in function (or use), or adaptation, of any 

 two parts, without reference to origin. It relates to superficial resem- 

 blances, while homology relates to fundamental or genetic relationships. 



