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action actual adaptation American animals appears argument become believe brings called causes close Cloth common conclusion connection consider continued creation Darwin derivation descended direct distinct divine doctrine doubt effect equally evidence evolution existence expected explain facts favor final force forms genera ground hand human hypothesis idea illustration increase individuals infer insects instance kind known laws least leaves less living material matter means mind natural selection naturalists object observation operation organic origin parent particular perhaps period philosophical physical plants present principle probably produced prove question races reason referred regard remarks reviewer scientific seems sense side similar species structure succession suggest suppose theory things thought tion tree types universe variation varieties vary vegetable volume whole
Seite 311 - NICHOLSON. A Manual of Zoology, for the use of Students. With a General Introduction on the Principles of Zoology. By HENRY ALLEYNE NICHOLSON, MD, D.Sc., FLS, FGS, Regius Professor of Natural History in the University of Aberdeen.
Seite 87 - To my mind it accords better with what we know of the laws impressed on matter by the Creator, that the production and extinction of the past and present inhabitants of the world should have been due to secondary causes, like those determining the birth and death of the individual.
Seite 18 - There is no exception to the rule that every organic being naturally increases at so high a rate, that if not destroyed, the earth would soon be covered by the progeny of a single pair.
Seite 62 - I can entertain no doubt, after the most deliberate study and dispassionate judgment of which I am capable, that the view which most naturalists until recently entertained; and which I formerly entertained — namely, that each species has been independently created — is erroneous. I am fully convinced that species are not immutable ; but that those belonging to what are called the same genera are lineal descendants of some other and generally extinct species, in the same manner as the acknowledged...
Seite 198 - My substance was not hid from thee, when I was made in secret, and curiously wrought in the lowest parts of the earth.
Seite 307 - Cloth, $1.75. CRITIQUES AND ADDRESSES. 12mo. Cloth, $1.50. AMERICAN ADDRESSES; WITH A LECTURE ON THE STUDY OF BIOLOGY. 12mo. Cloth, $1.25. PHYSIOGRAPHY : AN INTRODUCTION TO THE STUDY OF NATURE. With Illustrations and Colored Plates. 12mo. Cloth, $2.50.
Seite 17 - The green and budding twigs may represent existing species; and those produced during each former year may represent the long succession of extinct species. At each period of growth all the growing twigs have tried to branch out on all sides, and to overtop and kill the surrounding twigs and branches, in the same manner as species and groups of species have tried to overmaster other species in the great battle for life.
Seite 18 - Nothing is easier than to admit in words the truth of the universal struggle for life, or more difficult — at least I have found it so — than constantly to bear this conclusion in mind.
Seite 67 - Every species has come into existence coincident both in time and space with a pre-existing closely allied species" connects together and renders intelligible a vast number of independent and hitherto unexplained facts.