I think no better evidence of this can be required than that the two most experienced observers who have ever lived, namely Kolreuter and Gartner, arrived at diametrically opposite conclusions in regard to some of the very same forms.
Uste dut ezin daitekeela honen froga hoberik eska, sekula izan diren bi behatzaile arituenak, Kölreuter eta Gärtner, forma berberei buruz ondorio erabat aurkakoetara heldu izatea baino.