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A Part developed in any Species in an extraordinary degree or manner, in comparison with the same Part in allied Species, tends to be highly variable.

On the Origin of Species Laws of Variation

Several years ago I was much struck by a remark to the above effect made by Mr. Waterhouse. Profe...

Updated 4 years ago by Textpedia

Multiple, Rudimentary, and Lowly-organised Structures are Variable.

On the Origin of Species Laws of Variation

It seems to be a rule, as remarked by Is. Geoffroy St. Hilaire, both with varieties and species, ...

Updated 4 years ago by Textpedia

Compensation and Economy of Growth.

On the Origin of Species Laws of Variation

The elder Geoffroy and Goethe propounded, at about the same time, their law of compensation or ba...

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Correlated variation.

On the Origin of Species Laws of Variation

I mean by this expression that the whole organisation is so tied together, during its growth and ...

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Acclimatisation.

On the Origin of Species Laws of Variation

Habit is hereditary with plants, as in the period of flowering, in the time of sleep, in the amou...

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Effects of the increased use and disuse of parts, as controlled by natural selection.

On the Origin of Species Laws of Variation

From the facts alluded to in the first chapter, I think there can be no doubt that use in our dom...

Updated 4 years ago by Textpedia

Effects of Changed Conditions

On the Origin of Species Laws of Variation

I have hitherto sometimes spoken as if the variations — so common and multiform with organic bein...

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The Term, Struggle for Existence, Used in a Large Sense

On the Origin of Species Struggle for Existence

I should premise that I use this term in a large and metaphorical sense, including dependence of ...

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Geometrical Ratio of Increase.

On the Origin of Species Struggle for Existence

A struggle for existence inevitably follows from the high rate at which all organic beings tend t...

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Nature of the Checks to Increase.

On the Origin of Species Struggle for Existence

The causes which check the natural tendency of each species to increase are most obscure. Look at...

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Complex Relations of all Animals and Plants to Each Other in the Struggle for Existence.

On the Origin of Species Struggle for Existence

Many cases are on record showing how complex and unexpected are the checks and relations between ...

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Struggle for Life most severe between Individuals and Varieties of the same Species.

On the Origin of Species Struggle for Existence

As the species of the same genus usually have, though by no means invariably, much similarity in ...

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The Bearing of Struggle for Existence on Natural Selection

On the Origin of Species Struggle for Existence

Before entering on the subject of this chapter, I must make a few preliminary remarks to show how...

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Summary of Chapter.

On the Origin of Species Natural Selection; or the Survival of t...

If under changing conditions of life organic beings present individual differences in almost ever...

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Convergence of Character.

On the Origin of Species Natural Selection; or the Survival of t...

Mr. H. C. Watson thinks that I have overrated the importance of divergence of character (in which...

Updated 4 years ago by Textpedia

On the degree to which organisation tends to advance.

On the Origin of Species Natural Selection; or the Survival of t...

Natural selection acts exclusively by the preservation and accumulation of variations, which are ...

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Natural Selection: Its Power Compared with Man’s Selection

On the Origin of Species Natural Selection; or the Survival of t...

How will the struggle for existence, briefly discussed in the last chapter, act in regard to vari...

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Epigrams

On the Origin of Species

“But with regard to the material world, we can at least go so far as this—we can perceive that ev...

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Introduction

On the Origin of Species

When on board H.M.S. 'Beagle,' as naturalist, I was much struck with certain facts in the distrib...

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Causes of Variability

On the Origin of Species Variation under Domestication

When we look to the individuals of the same variety or sub-variety of our older cultivated plants...

Updated 4 years ago by Textpedia