The Variation of Animals And Plants Under Domestication
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Fanciers can act by selection on excessively slight individual differences, as well as on those greater differences which are called sports. Selection is followed methodically when the fancier tries to improve and modi- fy a breed according to a prefixed standard of excellence ; or he acts unmethodically and unconsciously, by merely trying to rear as good birds as he can, without any wish or intention to alter the breed. The progress of selection almost inevitably leads to the neglect and ultim...ate extinc- tion of the earlier and less improved forms, as well as of many intermediate links in each long line of descent, Thus it has come to pass that most of our present races are so marvellously distinct from each other, and from the aboriginal rock-pigeon.
Chat. VII. FOWLS. 273 CHAPTER VIL FOWLS.
BRIEF DESCRIPTIONS OP THE CHIEF BREEDS — ARGUMENTS IN FA- VOUR OF THEIR DESCENT FROM SEVERAL SPECIES — ARGUMENTS IN FAVOUR OF ALL THE BREEDS HAVING DESCENDED FROM GAL- LUS BANKIVA — REVERSION TO THE PARENT-STOCK IN COLOUR — ANALOGOUS VARIATIONS — ANCIENT HISTORY OF THE FOWL — EX- TERNAL DIFFERENCES BETWEEN THE SEVERAL BREEDS — EGGS — CHICKENS — SECONDARY SEXUAL CHARACTERS — WING- AND TADL- FEATHERS, VOICE, DISPOSITION, ETC.
What to read after The Variation of Animals And Plants Under Domestication?
You can find similar books in the "Read Also" column, or choose other free books by Darwin, Charles, 1809-1882 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Fanciers can act by selection on excessively slight individual differences, as well as on those greater differences which are called sports. Selection is followed methodically when the fancier tries to improve and modi- fy a breed according to a prefixed standard of excellence ; or he acts unmethodically and unconsciously, by merely trying to rear as good birds as he can, without any wish or intention to alter the breed. The progress of selection almost inevitably leads to the neglect and ultim...ate extinc- tion of the earlier and less improved forms, as well as of many intermediate links in each long line of descent, Thus it has come to pass that most of our present races are so marvellously distinct from each other, and from the aboriginal rock-pigeon.
Chat. VII. FOWLS. 273 CHAPTER VIL FOWLS.
BRIEF DESCRIPTIONS OP THE CHIEF BREEDS — ARGUMENTS IN FA- VOUR OF THEIR DESCENT FROM SEVERAL SPECIES — ARGUMENTS IN FAVOUR OF ALL THE BREEDS HAVING DESCENDED FROM GAL- LUS BANKIVA — REVERSION TO THE PARENT-STOCK IN COLOUR — ANALOGOUS VARIATIONS — ANCIENT HISTORY OF THE FOWL — EX- TERNAL DIFFERENCES BETWEEN THE SEVERAL BREEDS — EGGS — CHICKENS — SECONDARY SEXUAL CHARACTERS — WING- AND TADL- FEATHERS, VOICE, DISPOSITION, ETC.
What to read after The Variation of Animals And Plants Under Domestication?
You can find similar books in the "Read Also" column, or choose other free books by Darwin, Charles, 1809-1882 to read onlineMoreLess
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