64 HISTORY OF BOTANY. 



all essential particulars his canons still remain a law to 

 botanists. Nothing will better illustrate the principles of 

 modern botanical nomenclature than these canons. They 

 are as follow : — 



I. The names of plants are of two kinds : those of the 

 class and order, which are understood; and those of the 

 genus and species, which are expressed. The name of the 

 class and order never enter into the denominations of a plant. 



3. All plants agreeing in genus are to have the same 

 generic name. 



3. All i)lants differing in genus are to have a distinct 

 generic name. 



4. Each generic name must be single. 



5. Two different genera cannot be designated by the 

 same name. 



6. It is the business of those who distinguish new genera 

 to name them. 



7. Generic names derived from barbarous languages 

 ought on no account to be admitted. 



8. Generic names compounded of two entire words are 

 improper, and ought to be excluded. Thus Vitis-Idsea 

 must give way to Vaccinium, and Crista- Galli to Khi- 

 nanthus. 



9. Generic names formed of two Latin words are scarcely 

 tolerable. Some of them have been admitted, such as 

 Cornuco^i<^, 'Rosmarinus, Sempert'w?t??i, &c., but these 

 examples are not to be imitated. 



10. Generic names formed half of Latin and half of 

 Greek are hybrid, and on no account to be admitted ; such as 

 Cardamm^2(^?72, ChrysanthemincZzt??i, &c. 



II. Generic names compounded of the entire generic 

 name of one plant, and a portion of that of another, are 

 unworth}" of Botany; Cannacorz6S, lAMonarcissus^ Lauro- 

 cerasiis. 



