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 



Chapter XXIII. 



Explanation of the Linnaean artificial system •,..,, p. 206 



Chapter XXIV. 

 Illustrations of the Linnaean classes and orders p. 3 II 



Explanation of the plates , , , p. 389 



