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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
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.
The four parts were united under one title to form the publication, Darwin, C. R. & Wallace, A. R. 1858. On the tendency of species to form varieties; and on the perpetuation of varieties and species by natural means of selection.
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 ...
15 de may. de 2005 · Wallace's 1858 paper ‘On the tendency of varieties to depart indefinitely from the original type’ is often thought to present a theory of natural selection identical with that of Darwin.
