CONTENTS 



PREFACE IX 



INTRODUCTION xiii 



BOOK I 



OF THE PARTS OF PLANTS AND THEIR COMPOSITION". 

 OF CLASSIFICATION 



Introductory : How plants are to be classified ; difficulty 

 of defining what are the essential ' parts ' of a plant, 

 especially if plants are assumed to correspond to 

 animals 3 



The essential parts of plants, and the materials of which 



they are made 9 



Definitions of the various classes into which plants may 



be divided 23 



Exact classification impracticable : other possible bases 



of classification 27 



Differences as to appearance and habitat 29 



Characteristic differences in the parts of plants, whether 



general, special, or seen in qualities and properties 33 



Differences as to qualities and properties 37 



Further 'special' differences 39 



Differences in root 41 



Of trees (principally) and their characteristic special 



differences : as to knots 5o 



As to habit 61 



As to shedding of leaves 63 



Differences in leaves 69 



Composition of the various parts of a plant 77 



Differences in seeds 79 



