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original and permanent distinctness of species is, that varieties produced in a state of domesticity are more or less unstable, and often have a tendency, if left to themselves, to return to the normal form of the parent species; and this instability is considered to be a
- Alfred Russel Wallace
- 2016
In the absence or scarcity of facts and observations as to varieties occurring among wild animals, this argument has had great weight with naturalists, and has led to a very general and somewhat prejudiced belief in the stability of species.
- Alfred Russel Wallace
- 2016
Wallace wrote his paper On The Tendency of Varieties to Depart Indefinitely from the Original Type at Ternate in February 1858 and sent it to Darwin with a request to send it on to Lyell.
- A. Radcliffe-Smith, Charles Darwin
- 1858
On the Tendency of Varieties to Depart Indefinitely from the Original Type. Alfred Russel Wallace. One of the strongest arguments which have been adduced to prove the original and permanent distinctness of species is, that varieties produced in a state of domesticity are more or less unstable, and often have a tendency, if left to themselves ...
Estando en Ternate, escribió "On the tendency of varieties to depart indefinitely from the original type", una descripción brillante, clara y concisa sobre el origen y posterior divergencia de las especies, que envió a Darwin para obtener su opinión.
On the tendency of species to form varieties; and on the perpetuation of varieties and species by natural means of selection. Journal of the Proceedings of the Linnean Society of London, Zoology, 3 (9): 45-62. [with an introduction by Charles Lyell and Joseph Hooker].
Hace 3 días · On the Tendency of Varieties to Depart Indefinitely from the Original Type. The Struggle for Existence. The life of wild animals is a struggle for existence. The full exertion of all...
