and this implies variation. It would be equally rash to assert that characters now increased to their utmost limit, could not, after remaining fixed for many centuries, again vary under new conditions of life.
Halaber, arinegi ibiltzea izanen litzateke hau esatea: gaurko egunean beren ohiko mugaraino gehituriko ezaugarriak, mendeetan finko iraun ondoren, bizi-baldintza berrien pean ezin alda daitezkeela berriro.