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Quote by August Weismann

“The world has been evolved, not created: it has arisen little by little from a small beginning, and has increased through the activity of the elemental forces embodied in itself, and so has rather grown than come into being at an almighty word.”

Quote by August Weismann

Work

The Evolution Theory

This book provides an in-depth analysis of the theory of evolution, tracing its origins from early naturalists to the modern synthesis. It covers the mechanisms of natural selection, genetic variation, and speciation, while also addressing common misconceptions and the evidence supporting evolutionary biology. The text discusses the theory's implications for understanding the diversity of life on Earth and its foundational role in contemporary biological sciences. more

Author

August Weismann
August Weismann

August Weismann was a German biologist known for his contributions to the field of genetics. His theories had a profound impact on the development of modern genetics. more

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“During cycles long anterior to the creation of the human race, and while the surface of the globe was passing from one condition to another, whole races of animals-each group adapted to the physical conditions in which they lived-were successively created and exterminated.”

“Evolution in the biosphere is therefore a necessarily irreversible process defining a direction in time; a direction which is the same as that enjoined by the law of increasing entropy, that is to say, the second law of thermodynamics. This is far more than a mere comparison: the second law is founded upon considerations identical to those which establish the irreversibility of evolution. Indeed, it is legitimate to view the irreversibility of evolution as an expression of the second law in the biosphere.”

“In every animal which has not passed the limit of its development, a more frequent and continuous use of any organ gradually strengthens, develops and enlarges that organ, and gives it a power proportional to the length of time it has been so used; while the permanent disuse of any organ imperceptibly weakens and deteriorates it, and progressively diminishes its functional capacity, until it finally disappears.”

“For in disease the most voluntary or most special movements, faculties, etc., suffer first and most, that is in an order the exact opposite of evolution. Therefore I call this the principle of Dissolution.”

“However, if we consider that all the characteristics which have been cited are only differences in degree of structure, may we not suppose that this special condition of organization of man has been gradually acquired at the close of a long period of time, with the aid of circumstances which have proved favorable? What a subject for reflection for those who have the courage to enter into it!”

“I am above the forest region, amongst grand rocks & such a torrent as you see in Salvator Rosa's paintings vegetation all a scrub of rhodods. with Pines below me as thick & bad to get through as our Fuegian Fagi on the hill tops, & except the towering peaks of P. S. that, here shoot up on all hands there is little difference in the mt scenery—here however the blaze of Rhod. flowers and various colored jungle proclaims a differently constituted region in a naturalists eye & twenty species here, to one there, always are asking me the vexed question, where do we come from?”