Xl INTRODUCTION. 



3. All plants differing in genus are to 

 have a distinct generic name. 



8. Generic names compounded of two 

 entire words are improper, and ought to 

 be excluded. Thus, Vitis Idea must give 

 way to Vaccinium, and Crista Galli to 

 Rhinanthus. 



20. Adjective generic names are not 

 so good as substantive ones, but may be 

 admitted. 



23. Generic names that express the 

 essential character or habit of a plant are 

 the best of all. 



24. The ancient names of the classics 

 are to be respected. 



25. We have no right to alter one 

 ancient generic name to one more modern, 

 even though it may be for the better : 

 this would in the first place be an endless 

 labour, and in the next place would tend 

 to inextricable confusion. 



26. If new generic names are wanted, 

 it must first be ascertained whether no 

 one among the existing synonyms is ap- 

 plicable. 



27. If an old genus is divided into 



