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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.
Several years ago I was much struck by a remark to the above effect made by Mr. Waterhouse. Profe...
Multiple, Rudimentary, and Lowly-organised Structures are Variable.
It seems to be a rule, as remarked by Is. Geoffroy St. Hilaire, both with varieties and species, ...
Compensation and Economy of Growth.
The elder Geoffroy and Goethe propounded, at about the same time, their law of compensation or ba...
Correlated variation.
I mean by this expression that the whole organisation is so tied together, during its growth and ...
Acclimatisation.
Habit is hereditary with plants, as in the period of flowering, in the time of sleep, in the amou...
Effects of the increased use and disuse of parts, as controlled by natural selection.
From the facts alluded to in the first chapter, I think there can be no doubt that use in our dom...
Effects of Changed Conditions
I have hitherto sometimes spoken as if the variations — so common and multiform with organic bein...
The Term, Struggle for Existence, Used in a Large Sense
I should premise that I use this term in a large and metaphorical sense, including dependence of ...
Geometrical Ratio of Increase.
A struggle for existence inevitably follows from the high rate at which all organic beings tend t...
Nature of the Checks to Increase.
The causes which check the natural tendency of each species to increase are most obscure. Look at...
Complex Relations of all Animals and Plants to Each Other in the Struggle for Existence.
Many cases are on record showing how complex and unexpected are the checks and relations between ...
Struggle for Life most severe between Individuals and Varieties of the same Species.
As the species of the same genus usually have, though by no means invariably, much similarity in ...
The Bearing of Struggle for Existence on Natural Selection
Before entering on the subject of this chapter, I must make a few preliminary remarks to show how...
Summary of Chapter.
If under changing conditions of life organic beings present individual differences in almost ever...
Convergence of Character.
Mr. H. C. Watson thinks that I have overrated the importance of divergence of character (in which...
On the degree to which organisation tends to advance.
Natural selection acts exclusively by the preservation and accumulation of variations, which are ...
Natural Selection: Its Power Compared with Man’s Selection
How will the struggle for existence, briefly discussed in the last chapter, act in regard to vari...
Epigrams
“But with regard to the material world, we can at least go so far as this—we can perceive that ev...
Introduction
When on board H.M.S. 'Beagle,' as naturalist, I was much struck with certain facts in the distrib...
Causes of Variability
When we look to the individuals of the same variety or sub-variety of our older cultivated plants...