de Candolle has shown that those species which spread widely tend generally to spread VERY widely, consequently they will tend to supplant and exterminate several species in several areas, and thus check the inordinate increase of specific forms throughout the world. Dr.
de Candollek frogatu du zabal hedatzen diren espezie hauek oso zabal hedatzeko joera dutela; horregatik hainbat herrialdetan hainbat espezie ordezkatu eta sakailatzera joko dute, eta era horretan munduan formak desordenaz gehitzea galaraziko dute.