On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for Life |
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Page 15
... slight variations . I will then pass on to the variability of species in a state of nature ; but I shall , unfortunately , be compelled to treat this subject far too briefly , as it can be treated properly only by giving long catalogues ...
... slight variations . I will then pass on to the variability of species in a state of nature ; but I shall , unfortunately , be compelled to treat this subject far too briefly , as it can be treated properly only by giving long catalogues ...
Page 22
... slight amount of change may , I think , be attributed to the direct action of the conditions of life - as , in some cases , increased size from amount of food , colour from particular kinds of food , and perhaps the thickness of fur ...
... slight amount of change may , I think , be attributed to the direct action of the conditions of life - as , in some cases , increased size from amount of food , colour from particular kinds of food , and perhaps the thickness of fur ...
Page 23
... slight and those of considerable physiological importance , are endless . Dr. Prosper Lucas's treatise , in two large volumes , is the fullest and the best on this subject . No breeder doubts how strong is the tendency to inheritance ...
... slight and those of considerable physiological importance , are endless . Dr. Prosper Lucas's treatise , in two large volumes , is the fullest and the best on this subject . No breeder doubts how strong is the tendency to inheritance ...
Page 25
... slight deviations in their structure , in such case I grant that we could deduce nothing from domestic varieties in regard to species . But there is not a shadow of evidence in favour of this view to assert that we could not breed our ...
... slight deviations in their structure , in such case I grant that we could deduce nothing from domestic varieties in regard to species . But there is not a shadow of evidence in favour of this view to assert that we could not breed our ...
Page 28
... slight , has had its wild prototype . At this rate there must have existed at least a score of species of wild cattle , as many sheep , and several goats in Europe alone , and several even within Great Britain . One author believes that ...
... slight , has had its wild prototype . At this rate there must have existed at least a score of species of wild cattle , as many sheep , and several goats in Europe alone , and several even within Great Britain . One author believes that ...
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Common terms and phrases
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 larvæ 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