Mongrels

• The variability, however, in the successive generations of mongrels is, perhaps, greater than in hybrids. 查尔斯·达尔文. 物种起源.
• This greater variability in mongrels than in hybrids does not seem at all surprising. 查尔斯·达尔文. 物种起源.
• Both hybrids and mongrels can be reduced to either pure parent form, by repeated crosses in successive generations with either parent. 查尔斯·达尔文. 物种起源.

校对:西尔玛