On the Origin of the 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 60
Page viii
... Fertility of varieties when crossed and of their mongrel offspring not uni- versal — Hybrids and mongrels compared independently of their fertility Summary .. Page 299-344 - CHAPTER IX . ON THE IMPERFECTION OF THE GEOLOGICAL RECORD . On ...
... Fertility of varieties when crossed and of their mongrel offspring not uni- versal — Hybrids and mongrels compared independently of their fertility Summary .. Page 299-344 - CHAPTER IX . ON THE IMPERFECTION OF THE GEOLOGICAL RECORD . On ...
Page xii
... fertility of varieties when crossed , in contrast with species , corrected . Infertility of varieties of Verbascum when crossed . On subaerial denudation . On the rate of subaerial denudation , as measured by years , and on the probable ...
... fertility of varieties when crossed , in contrast with species , corrected . Infertility of varieties of Verbascum when crossed . On subaerial denudation . On the rate of subaerial denudation , as measured by years , and on the probable ...
Page 5
... fertility of varieties when intercrossed ; and fourthly , the imper- fection of the Geological Record . In the next chapter I shall consider the geological succession of organic beings throughout time ; in the eleventh and twelfth ...
... fertility of varieties when intercrossed ; and fourthly , the imper- fection of the Geological Record . In the next chapter I shall consider the geological succession of organic beings throughout time ; in the eleventh and twelfth ...
Page 10
... fertile eggs . Many exotic plants have pollen utterly worthless , in the same con- dition as in the most sterile hybrids . When , on the one hand , we see domesticated animals and plants , though often weak and sickly , yet breeding ...
... fertile eggs . Many exotic plants have pollen utterly worthless , in the same con- dition as in the most sterile hybrids . When , on the one hand , we see domesticated animals and plants , though often weak and sickly , yet breeding ...
Page 17
... fertility of varieties when crossed , -a subject hereafter to be dis- cussed ) , domestic races of the same species differ from each other , only in most cases in a less degree , in the same manner as do closely - allied species of the ...
... fertility of varieties when crossed , -a subject hereafter to be dis- cussed ) , domestic races of the same species differ from each other , only in most cases in a less degree , in the same manner as do closely - allied species of the ...
Other editions - View all
Common terms and phrases
accumulated adapted affinities allied species America ancient appear Asa Gray become bees believe birds breeds cause cells characters cirripedes climate closely allied colour common continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt Edition eggs embryo existing exterminated extinct extremely facts favourable females fertilised fertility flowers formation forms fossil Fritz Müller Gärtner genera genus geological Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate larvæ less living males mammals manner migration modified descendants natural selection naturalists nearly nest occur oceanic islands offspring organisation parent perfect pigeons pistil pollen Post 8vo present principle probably produced progenitor racters ranked reciprocal crosses remarked resemble seeds sexual sexual selection Silurian slight South America stamens sterility structure struggle successive suppose theory tion variability variations varieties vary vols whole widely