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Effects of Habit and the Use or Disuse of Parts; Correlated Variation; Inheritance.
Changed habits produce an inherited effect as in the period of the flowering of plants when trans...
Character of Domestic Varieties; difficulty of distinguishing between Varieties and Species; origin of Domestic Varieties from one or more Species.
When we look to the hereditary varieties or races of our domestic animals and plants, and compare...
Breeds of the Domestic Pigeon, their Differences and Origin.
Believing that it is always best to study some special group, I have, after deliberation, taken u...
Principles of Selection anciently followed, and their Effects.
Let us now briefly consider the steps by which domestic races have been produced, either from one...
Unconscious Selection.
At the present time, eminent breeders try by methodical selection, with a distinct object in view...
Circumstances favourable to Man's power of Selection.
I will now say a few words on the circumstances, favourable or the reverse, to man's power of sel...
Individual Differences
The many slight differences which appear in the offspring from the same parents, or which it may ...
Doubtful Species
The forms which possess in some considerable degree the character of species, but which are so cl...
Wide-ranging, much-diffused, and common Species vary most.
Guided by theoretical considerations, I thought that some interesting results might be obtained i...
Species of the Larger Genera in each Country vary more frequently than the Species of the Smaller Genera.
If the plants inhabiting a country as described in any Flora, be divided into two equal masses, a...
Many of the Species included within the Larger Genera resemble Varieties in being very closely, but unequally, related to each other, and in having restricted ranges.
There are other relations between the species of large genera and their recorded varieties which ...
Summary.
Finally, varieties cannot be distinguished from species,— except, first, by the discovery of inte...
The Probable Effects of the Action of Natural Selection through Divergence of Character and Extinction, on the Descendants of a Common Ancestor.
After the foregoing discussion, which has been much compressed, we may assume that the modified d...
Divergence of Character.
The principle, which I have designated by this term, is of high importance, and explains, as I be...
Extinction caused by Natural Selection.
This subject will be more fully discussed in our chapter on Geology; but it must here be alluded ...
Circumstances favourable for the production of new forms through Natural Selection.
This is an extremely intricate subject. A great amount of variability, under which term individua...
On the Intercrossing of Individuals.
I must here introduce a short digression. In the case of animals and plants with separated sexes,...
Illustrations of the Action of Natural Selection, or the Survival of the Fittest.
In order to make it clear how, as I believe, natural selection acts, I must beg permission to giv...
Sexual Selection.
Inasmuch as peculiarities often appear under domestication in one sex and become hereditarily att...
The Last Days of John Brown
Read at North Elba, July 4, 1860. John Brown's career for the last six weeks of his life was met...