THE FORMATION OF VARIETIES. 1?T 



varieties under domestication, Man effects the reduc- 

 tion or suppression of characters, which were not 

 reduced or suppressed under nature ; 



10. By the retention of the individuals, of several 

 varieties, at each stage of such degeneration; thus ac- 

 counting for the sub-varieties of the ninth class ; 



1 1. By the re-development of one only of the charac- 

 ters which have been lost, suppressed or reduced under 

 nature ; 



12. By the retention of the individuals of several 

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

 one character which was lost, suppressed or reduced 

 under nature, thus accounting for sub-varieties of the 

 eleventh class. 



Take a hundred rubber balls, of like size and charac- 

 ter, and compress them all to half their size; then, in 

 ten, or a dozen of the balls, relax the pressure, in a dif- 

 ferent part, in each ball ; then, in others of the balls, re- 

 lax, but slightly, the pressure, in each ball, in a part 

 corresponding to the part with its pressure relaxed, in 

 one of the balls of the first class ; then, in other balls, 

 relax the pressure all around, but in a different degree, 

 in each ball ; then, in other balls, instead of relaxing the 

 pressure, much increase the pressure, upon a different 

 part, in each ball; then, in other balls, instead of greatly 

 increasing the pressure, in a different part, in each ball, 

 increase the pressure, but increase it somewhat less, 

 in a descending degree, in a part in each ball, corres- 

 ponding to the same part in each of the balls of the 

 preceding class ; then, in other balls, increase the pres- 

 sure, all around, in a degree varying with each ball, 

 16 



