On the view that species are only strongly marked and permanent varieties, and that each species first existed as a variety, we can see why it is that no line of demarcation can be drawn between species, commonly supposed to have been produced by special acts of creation, and varieties which are acknowledged to have been produced by secondary laws.
Espezieak aldaki indartsu markatu eta iraunkorrak besterik ez direla dioen teoriaren barruan, ikus dezakegu zergatik ez dagoen bereiz-lerrorik marratzerik eskuarki kreazio-egintza bereziz sortuak direla uste den espezieen eta lege sekundarioz sortuak direla badakigun aldakien artean.