XXX.] CLASSIFICATION. 727 



With the progress of botany intermediate and additional 

 groups have gradually been introduced. According to the 

 Laws of Botanical Nomenclature adopted by the Inter- 

 national Botanical Congress, held at Paris ^ in August 

 1867, no less than twenty-one names of classes are re- 

 cognised — namely, Kingdom, Division, Sub -division, Class, 

 Sub-class, Cohort, Sub-cohort, Order, Sub-order, Tribe, Sub- 

 tribe, Genus, Sub-genus, Section, Sub-section, Species, Sub- 

 species, Variety, Sub- variety. Variation, Sub -variation. It 

 is allowed by the authors of this scheme, that the rank or 

 degree of importance to be attributed to any of these divi- 

 sions may vary in a certain degree according to individual 

 opinion. The only point on which botanists are not allowed 

 discretion is as to the order of the successive sub-divisions ; 

 any inversion of the arrangement, such as division of a 

 genus into tribes, or of a tribe into orders, is quite inad- 

 missible. There is no reason to suppose that even the 

 al)ove list is complete and inextensible. The Botanical 

 Congress itself recognised the distuiction between variations 

 according as they are Seedlings, Half-breeds, or Lusus 

 Naturce. The complication of the inferior classes is in- 

 creased again by the existence of hyhrids, arising from the 

 fertilisation of one species by another deemed a distinct 

 species, nor can we place any limit to the minuteness of 

 discrimination of degrees of breeding short of an actual 

 pedigree of individuals. 



It will be evident to the reader that in the remarks 

 upon classification as applied to the Natural Sciences, 

 given in this and the preceding sections, I li;ue not in the 

 ]ea.st attempted to treat the subject in a manner adequate 

 to its extent and importance. A volume would be insuf- 

 ficient ibr tracing out the principles of scientific method 

 specially applicable to these branches of science. What 

 more I may be able to say upon the subject will be l)etter 

 said, if ever, when I am able to take up the closely- 

 connected subjects of Scientific Nomenclature, Terminology, 

 and Descriptive Representation. In the meantime, I have 

 wished to show, in a negative point of view, that natural 

 chu-isitication in the animal and vegetable kingdoms is 

 a special problem, and that the particular methods and 



' Laws of Botanical Nomenclature, byAlplionse Decandolle, trans- 

 'jiUmJ Irom the French, 18C8, p. 19. 



