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Updated: May 4, 2025
It has of course a wide range of fluctuating variability, but the lower limit has been worked up to about 34 rays, a figure never reached by the grandiflorum parent, from which my new variety is thus sharply separated. Unfortunately the best flowers and even the best individuals of my race are wholly barren. Selection has reached its practical limit.
But these nations have come out of the 'pre-economic stage' too soon; they have been put to learn while yet only too apt to unlearn. Such cases do not vitiate, they confirm, the principle that a nation which has just gained variability without losing legality has a singular likelihood to be a prevalent nation.
Gartner further admits that hybrids between very closely allied species are more variable than those from very distinct species; and this shows that the difference in the degree of variability graduates away.
There is, also, I think, some probability in the view propounded by Andrew Knight, that this variability may be partly connected with excess of food.
Spohr has the severe phlegmatic Teutonic aspect; Sivori has the flashing Italian eye and variability of feature. Spohr stands firm and still; Sivori's body is all on the swing, he tears the notes, as it were, from his instrument.
This type is commonly called "individual variability" and since this term also has still other meanings, it has of late become customary to use instead the term "fluctuating variability." And to avoid the repetition of the latter word it is called "fluctuation."
Mark's Crescent, N.W. January 30, 1869. Dear Darwin, Will you tell me where are Fleeming Jenkin's arguments on the importance of single variation? Because I at present hold most strongly the contrary opinion, that it is the individual differences or general variability of species that enables them to become modified and adapted to new conditions.
Hence, in studying the degrees of mental variability shown us in the daily lives of the different races, we must ask how far variability characterizes the whole mind, and how far it holds only of parts of the mind. Impulsiveness. This trait is closely allied with the last: unenduring emotions are emotions which sway the conduct now this way and now that, without any consistency.
There may be truly said to be a constant struggle going on between, on the one hand, the tendency to reversion to a less modified state, as well as an innate tendency to further variability of all kinds, and, on the other hand, the power of steady selection to keep the breed true.
Causes of Variability Effects of Habit and the use and disuse of Parts Correlated Variation Inheritance Character of Domestic Varieties Difficulty of distinguishing between Varieties and Species Origin of Domestic Varieties from one or more Species Domestic Pigeons, their Differences and Origin Principles of Selection, anciently followed, their Effects Methodical and Unconscious Selection Unknown Origin of our Domestic Productions Circumstances favourable to Man's power of Selection.
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