CONTENTS. xix 



CHAPTER XXI. 



Of the diseases of plants, particularly as illustrative of their 

 vital principle p. 259 



CHAPTER XXII. 



Of the systematical arrangement of plants. Natural and 

 artificial methods. Genera, species and varieties. No- 

 menclature % ......... p. 267 



i CHAPTER XXIII. 

 Explanation of the Linnasan artificial system p. 296 



CHAPTER XXIV. 

 Illustrations of the Linnasan classes and orders p. 3 1 1 



Explanation of the plates p. 389 



