Изображения страниц
PDF
EPUB

“ Bat 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.”

WIEWELL: Dridjevater Treatise.

" The only distinct meaning of the word “natural' is stated, fixed, or settled ; since what is natural as much requires and presupposes an intelligent agent to render it so, i.e., to effect it continually or at stated times, as what is supernatural or miraculous does to effect it for once.”

BUTLER: Analogy of Revealed Religion.

“ 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.”

Bacon: Advancement of Laarning.

Down, Beckenham, K’ent,

First Edition, Novenber 24th, 1838.
Sirth Edition, Jan. 1973.

D 365
AIO
1875

CONTENTS. .

[merged small][ocr errors]

STRUGGLE FOR EXISTENCE.

its bearing on natural selection — The term used in a wide sense-Geome-

trical ratio of increase — Rapid increase of naturalised animals and

plants — Nature of the checks to increase - Competition universal-

Effects of climate - Protection from the number of individuals -

Complex relations of all animals and plants throughout nature -

Struggle for life most severe between individuals and varieties of the

same species : often severe between species of the same genus — The

relation of organism to organism the most important of all rela-

tions

48-01
133-167

various in degree, not universal, affected by close interbreeding, re-

moved by domestication — Laws governing the sterility of hybrids —

Sterility not a special endowment, but incidental on other differences,

not accumulated by natural selection – Causes of the sterility of first

crosses and of hybrids — Parallelism between the effects of changed

conditions of life and of crossing — Dimorphism and Trimorphism —

Fertility of varieties when crossed and of their mongrel offspring not

universal - Hybrids and mongrels compared independently of their

Sertility - Summary

231-203
islands - Absence of Batrachians and of terrestrial Mammals - On

CIAPTER XIII.

the relation of the inhabitants of islands to those of the nearest main-

land - On colonization from the nearest source with subsequent modi-

fication - Summary of the last and present chapter .. .. 343–363

« ПредыдущаяПродолжить »