Struggle for life most severe between individuals and varieties of the same species often severe between species of the same genus. Complex relations of all animals and plants throughout nature.

Protection from the number of individuals. Rapid increase of naturalised animals and plants. Many of the species of the larger genera resemble varieties in being very closely, but unequally, related to each other, and in having restricted ranges. Species of the larger genera in any country vary more than the species of the smaller genera. Wide ranging, much diffused, and common species vary most. Circumstances favourable to Man’s power of Selection. Unknown Origin of our Domestic Productions. Principle of Selection anciently followed, its Effects. Domestic Pigeons, their Differences and Origin. Origin of Domestic Varieties from one or more Species. VARIATION UNDER DOMESTICATION.ĭifficulty of distinguishing between Varieties and Species. BEAGLE’S VOYAGE ROUND THE WORLD.’ĬHAPTER 1. PRESERVATION OF FAVOURED RACES IN THE STRUGGLE FOR LIFE.įELLOW OF THE ROYAL, GEOLOGICAL, LINNAEAN, ETC., SOCIETIES ĪUTHOR OF ‘JOURNAL OF RESEARCHES DURING H.M.S. THE ORIGIN OF SPECIES BY MEANS OF NATURAL SELECTION, “To conclude, therefore, let no man out of a weak conceit of sobriety, or an ill-applied moderation, think or maintain, that a man can search too far or be too well studied in the book of God’s word, or in the book of God’s works divinity or philosophy but rather let men endeavour an endless progress or proficience in both.” “But with regard to the material world, we can at least go so far as this– we can perceive that events are brought about not by insulated interpositions of Divine power, exerted in each particular case, but by the establishment of general laws.”

The origin of species by charles darwin