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active amoeboid amphibians anabolic anabolism and katabolism asexual asexual reproduction associated become birds body buds carpels chromatin chromatin elements ciliated coelenterates colonies colour conjugation continuity contrast crustaceans Darwin degenerate dichogamy differentiation division ducts egg-cell eggs embryo emphasised essential evolution extrusion fact favour female cells female organs fertilisation fertilised ovum fishes flowers frog functions germ-cells germ-plasma germinal vesicle growth habit heredity hermaphroditism Hertwig higher animals hydroid illustrations important increase individual influence infusorians insects less male and female male elements mammals maturity natural selection naturalists normal nuclear nucleus nutritive observed occur offspring origin ovary ovum parasitic parent parthenogenetic passive physiological plants polar globules predominant preponderance primitive produce protoplasm Protozoa recognised regard reproductive cells reproductive elements reproductive organs result Rolph rotifers secondary sexual characters sex-cells sexual reproduction sexual selection species sperm spermatozoa sponges stage structure theory threadworm tion union unisexual usually variations vegetative Weismann yolk
Page 275 - Gavest thou the goodly wings unto the peacocks? Or wings and feathers unto the ostrich? Which leaveth her eggs in the earth, And warmeth them in the dust, And forgetteth that the foot may crush them, Or that the wild beast may break them. She is hardened against her young ones, As though they were not hers...
Page 324 - Independent. LIFE OF SHELLEY. By William Sharp. " The criticisms . . . entitle this capital monograph to be ranked with the best biographies of Shelley.
Page 324 - LIFE OF CHARLOTTE BRONTE. By A. Birrell. "Those who know much of Charlotte Bronte will learn more, and those who know nothing about her will find all that is best worth learning in Mr. Birrell's pleasant book.
Page 325 - Marzials's volume presents to us, in a more handy form than any English, or even French handbook gives, the summary of what, up to the moment in which we write, is known or conjectured about the life of the great poet.
Page 325 - Saturday Review. LIFE OF GOETHE. By James Sime. "Mr. James Sime's competence as a biographer of Goethe, both in respect of knowledge of his special subject, and of German literature generally, is beyond question.
Page 324 - LIFE OF DICKENS. By FRANK T. MARZIALS. "Notwithstanding the mass of matter that has been printed relating to Dickens and his works ... we should, until we came across this volume, have been at a loss to recommend any popular life of England's most popular novelist as being really satisfactory. The difficulty is removed by Mr. Marzials's little book."— Athenaeum.
Page 324 - Saturday Review. LIFE OF GOLDSMITH. By Austin Dobson. " The story of his literary and social life in London, with all its humorous and pathetic vicissitudes, is here retold, as none could tell it better.
Page 38 - I formerly thought that when a tendency to produce the two sexes in equal numbers was advantageous to the species, it would follow from natural selection, but I now see that the whole problem is so intricate that it is safer to leave its solution for the future.
Page 9 - To sum up on the means through which, as far as we can judge, sexual selection has led to the development of secondary sexual characters. It has been shown that the largest number of vigorous offspring will be reared from the pairing of the strongest and best-armed males...