FREE BOOKS

Author's List




PREV.   NEXT  
|<   306   307   308   309   310   311   312   313   314   >>  
n to the _Standard Natural History_, we proposed the term Neolamarckianism, or Lamarckism in its modern form, to designate the series of factors of organic evolution, and we take the liberty to quote the passage in which the word first occurs. We may add that the briefer form, Neolamarckism, is the more preferable. "In the United States a number of naturalists have advocated what may be called Neo-Lamarckian views of evolution, especially the conception that in some cases rapid evolution may occur. The present writer, contrary to pure Darwinians, believes that many species, but more especially types of genera and families, have been produced by changes in the environment acting often with more or less rapidity on the organism, resulting at times in a new genus, or even a family type. Natural selection, acting through thousands, and sometimes millions, of generations of animals and plants, often operates too slowly; there are gaps which have been, so to speak, intentionally left by Nature. Moreover, natural selection was, as used by some writers, more an idea than a _vera causa_. Natural selection also begins with the assumption of a tendency to variation, and presupposes a world already tenanted by vast numbers of animals among which a struggle for existence was going on, and the few were victorious over the many. But the entire inadequacy of Darwinism to account for the primitive origin of life forms, for the original diversity in the different branches of the tree of life forms, the interdependence of the creation of ancient faunas and floras on geological revolutions, and consequent sudden changes in the environment of organisms, has convinced us that Darwinism is but one of a number of factors of a true evolution theory; that it comes in play only as the last term of a series of evolutionary agencies or causes; and that it rather accounts, as first suggested by the Duke of Argyll, for the _preservation_ of forms than for their origination. We may, in fact, compare Darwinism to the apex of a pyramid, the larger mass of the pyramid representing the complex of theories necessary to account for the world of life as it has been and now is. In other words, we believe in a modified and greatly extended Lamarckianism, or what may be called Neo-Lamarckianism." [227] _Studies in the Theory of Descent_. By Dr. August Weismann. Translated and edited, with notes, by Raphael Meldola. London, 1882. 2 vols. [228] "The Influen
PREV.   NEXT  
|<   306   307   308   309   310   311   312   313   314   >>  



Top keywords:

evolution

 
Natural
 
selection
 

Darwinism

 
called
 
environment
 

acting

 

animals

 

pyramid

 

number


series

 

account

 
factors
 

Lamarckianism

 
entire
 

convinced

 

theory

 
victorious
 

inadequacy

 

primitive


interdependence

 

creation

 

original

 

diversity

 

branches

 
ancient
 

faunas

 

sudden

 
organisms
 

origin


consequent

 

floras

 

geological

 

revolutions

 
existence
 

compare

 

Descent

 

August

 

Theory

 
Studies

modified
 
greatly
 

extended

 

Weismann

 

Translated

 

Influen

 

London

 

edited

 
Raphael
 

Meldola