176 THE FORMATION OF VARIETIES. 



at several stages of reversion, accounting merely for 

 differences of size; 



2. By continuing the process, of degeneration, com- 

 menced under nature, and retaining the individuals of 

 the given species, at each stage of such degeneration, 

 also accounting merely for difference of size ; 



3. By the re-development of the long-lost characters 

 of the species, of which not a vestige remained; but, 

 with an apportionment, or distribution of them, among 

 different varieties ; 



4. By the retention, of the individuals of several 

 varieties, at each stage of the re-development of the 

 lost characters allotted to their respective varieties, 

 thus accounting for the sub-varieties of the third class ; 



5. By the re-development of the rudimentary organs 

 of the species, and their apportionment among different 

 varieties ; 



6. By the retention of the individuals of several 

 varieties, at each stage of the development of the 

 rudimentary organs allotted to their respective varie- 

 ties, thus accounting for the sub-varieties of the fifth 

 class ; 



7. By the extreme, and exclusive re-development 

 (or selection), of one part only, in each variety, among 

 those parts which have been only partially reduced, 

 under nature ; 



8. By the retention, of the individuals of several 

 varieties, at each stage of the re-development of those 

 parts, only partially reduced under nature ; thus ac- 

 counting for the sub-varieties of the seventh class ; 



9. By a process of degeneration, by which in several 



