On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeD. Appleton, 1909 - 430ÆäÀÌÁö |
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21 ÆäÀÌÁö
... producing offspring not perfectly like their parents Sterility has been said to be the bane of horticulture ; but on this view ... produced very little direct effect , though apparently more in the case of plants . Under VARIATION UNDER ...
... producing offspring not perfectly like their parents Sterility has been said to be the bane of horticulture ; but on this view ... produced very little direct effect , though apparently more in the case of plants . Under VARIATION UNDER ...
27 ÆäÀÌÁö
... produced under domestication ; I believe that some small part of the difference is due to their having descended from distinct species . ] In the case of some other domesticated species , there is presumptive , or even strong evidence ...
... produced under domestication ; I believe that some small part of the difference is due to their having descended from distinct species . ] In the case of some other domesticated species , there is presumptive , or even strong evidence ...
32 ÆäÀÌÁö
... produced by crossing two breeds unless one of the parent - stocks possessed the characteristic enormous crop ? The supposed aboriginal stocks must all have been rock - pigeons , that is , not breeding or willingly perching on trees ...
... produced by crossing two breeds unless one of the parent - stocks possessed the characteristic enormous crop ? The supposed aboriginal stocks must all have been rock - pigeons , that is , not breeding or willingly perching on trees ...
33 ÆäÀÌÁö
... fantails with a mongrel barb - spot , and they produced a bird of as beautiful a blue colour , with abit Late abi t Cate ነዉ ። arri eb igen sta rect vili it , abo 12 the white croup , double black wing - bar , 73 - B DOMESTIC PIGEONS 333.
... fantails with a mongrel barb - spot , and they produced a bird of as beautiful a blue colour , with abit Late abi t Cate ነዉ ። arri eb igen sta rect vili it , abo 12 the white croup , double black wing - bar , 73 - B DOMESTIC PIGEONS 333.
37 ÆäÀÌÁö
... produced , either from one or from several allied species . Some little effect may be attributed to the direct action of the external conditions of life , and some little to habit ; but he would be a bold man who would account by such ...
... produced , either from one or from several allied species . Some little effect may be attributed to the direct action of the external conditions of life , and some little to habit ; but he would be a bold man who would account by such ...
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accumulated adapted affinities allied species America analogous ancient animals appear archipelago become bees believe birds breeds cause cells characters cirripedes climate closely allied colour continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt embryo endemic existing exterminated extinct extremely facts favourable fertilised fertility flowers formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important increase individuals inhabitants inherited insects instance instincts intercrossing intermediate larv©¡ laws less living males mammals manner migration modification modified descendants natural selection naturalists nearly nest occasionally offspring organic organisation origin of species perfect pigeons plants pollen present principle probably produced progenitor ranked reciprocal crosses remarked resemble rock-pigeon rudimentary seeds sexual sexual selection Silurian slight sometimes South America sterility structure struggle successive supposed swimbladder tend theory variability variations varieties vary whole widely