On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for Life |
From inside the book
Results 1-5 of 22
Page 9
... cell - making instinct - Changes of instinct and structure not necessarily simultaneous - Difficulties on the theory of the Natural Selection of instincts - Neuter or sterile insects- Summary 189 CHAPTER VIII HYBRIDISM Distinction ...
... cell - making instinct - Changes of instinct and structure not necessarily simultaneous - Difficulties on the theory of the Natural Selection of instincts - Neuter or sterile insects- Summary 189 CHAPTER VIII HYBRIDISM Distinction ...
Page 122
... cell - constructing work ? In the case of the ostrich a moment's reflection will show that an enormous supply of food would be necessary in this bird of the desert , to supply force to move its huge body through the air . But such ill ...
... cell - constructing work ? In the case of the ostrich a moment's reflection will show that an enormous supply of food would be necessary in this bird of the desert , to supply force to move its huge body through the air . But such ill ...
Page 160
... cells , which has practically anticipated the discoveries of profound mathematicians ? Fourthly , how can we account for species , when crossed , being sterile and producing sterile offspring , whereas , when varieties are crossed ...
... cells , which has practically anticipated the discoveries of profound mathematicians ? Fourthly , how can we account for species , when crossed , being sterile and producing sterile offspring , whereas , when varieties are crossed ...
Page 189
... cell - making instinct - Changes of instinct and structure not necessarily simultaneous - Difficulties on the theory ... cells will probably have occurred to many readers , as a difficulty sufficient to overthrow my whole theory . I must ...
... cell - making instinct - Changes of instinct and structure not necessarily simultaneous - Difficulties on the theory ... cells will probably have occurred to many readers , as a difficulty sufficient to overthrow my whole theory . I must ...
Page 199
... cells and tended the larvæ , and put all to rights . What can be more extraordinary than these well - ascertained facts ? If we had not known of any other slave - making ant , it would have been hopeless to have speculated how so ...
... cells and tended the larvæ , and put all to rights . What can be more extraordinary than these well - ascertained facts ? If we had not known of any other slave - making ant , it would have been hopeless to have speculated how so ...
Other editions - View all
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