76 PLANT PHYSIOLOGY 



and the mode of its maintenance, with any special structures 

 to this end. (e) The development of tissues and of organs. 



Literature. For this the student would turn to the appropriate 

 sections in Pfeffer's " Physiology." The great work upon the physi- 

 ological and ecological phases of structure is Haberlandt's " Physi- 

 ologische Pflanzenanatomie." The subject of cell size and its determi- 

 nants is discussed fully by Sachs in his " Physiologische Notizen," in 

 Flora, 77, 1893, 49- Up° n protoplasmic continuity the latest and best 

 work is by StrasbuRGer in Jahrbiicher fur wissenschaftliche Botanik, 

 36, 1901, 493. 



