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chemical and geological essays

Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: more compact clays and marls, resisting the penetration of this liquid, will retain their soda, lime, and magnesia, and by subsequent alteration will give rise to basic feldspars containing lime and soda, and if lime and magnesia predominate, to hornblende or pyroxene. The presence or absence of iron in sediments demands especial consideration, since its elimination requires the interposition of organic matters, which, by reducing the peroxide to the condition of protoxide, render it soluble in water, either as bicarbonate or combined with some organic acid. This action of waters holding organic matter upon sediments containing iron-oxide has been described by Bischof and many other writers, particularly by Dr. J. W. Dawson in a paper on the coloring matters of some sedimentary rocks, and is applicable to all cases where iron has been removed from certain strata and accumulated in others. This is seen in the fire-clays and iron-stones of the coal-measures, and in the white clays associated with great beds of green-sand (essentially a silicate of iron) in the cretaceous series of New Jersey. Similar alternations of white feldspathic beds with others of iron-ore occur in the Green Mountain rocks of Canada, and on a still more remarkable scale in those of the Laurentian series. We may probably look upon the formation of beds of iron-ore as in all cases due to the intervention of organic matters ; so that its presence, not less than that of graphite, affords evidence of the existence of organic life at the time of the deposition of these old crystalline rocks. The agency of sulphuric and muriatic acids, from volcanic and other sources, is not, however, to be excluded in the solution of oxide of iron and other metallic oxides. The oxidation of pyrites, moreover, gives rise to so... --This text refers to the Paperback edition.

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Principles of comedy and dramatic effect

The dramatists.--Comedy.--Burlesque.--The French stage.--Actors, past and present.--The actors of the day.--The music hall question.--Postscript.--Appendix

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A short history of Christianity in the apostolic age

Series title also on t.-p

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zionism and the jewish future

Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: JUDAISM—A NATIONAL RELIGION By The Very Rev. Dr. M. Gaster. Many attempts have been made in the past to find a proper definition for Jews and Judaism, but all attempts seem to have failed. The reason is not far to seek. Those who have undertaken this task have been guided by modern conceptions, and have endeavoured to apply notions which fit the existing political and ethnical conditions to Jews and Judaism. But Jews and Judaism are not a modern growth, and do not conform to the conditions which prevail among the nations of Europe. The attempt has been made from different quarters and with different objects; but only on rare occasions have men of science also drawn within the sphere of their investigations the problem of the Jews. As a rule their various theories had to serve a definite purpose. They had to favour the view that the Jews are a nation, or that they are not a nation. Jews have also been studied from the point of view of the relation in which they stand to the other nations in whose midst they live. A conscious and sometimes an unconscious bias has crept into the investigation and coloured the results obtained. Side by side with it went the new conception of nationality, which has become so prominent a feature in modern times. Yet it would be very difficult to define adequately what a nation is or what a race is. Whatever answer might be given to these questions from the study of modern problems, it could not be made to fit the question as it applies to Jews and Judaism, Among the modern criteria of a nation, unity of language is given the first place. The racial differencehas been more and more neglected; nay, modern nations have gone so far as to attempt the obliteration of the racial origin by a policy of forcible unification on the basis of the same langu...

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The human worth of rigorous thinking; essays and addresses

Reprinted from "various scientific, literary, and philsophical journals." cf. Pref The human worth of rigorous thinking.--The human significance of mathematics.--The humanization of the teaching of mathematics.--The walls of the world; or, Concerning the figure and the dimensions of the universe of space.--Mathematical emancipations: dimensionality and hyperspace.--The universe and beyond: the existence of the hypercosmic.--The axiom of infinity: a new presupposition of thought.--The permanent basis of a liberal education.--Graduate mathematical instruction for graduate students not intending to become mathematicians.--The source and functions of a university.--Research in American universities.--Principia mathematica.--Concerning multiple interpretations of postulate systems and the "existence" of hyperspace.--Mathematical productivity in the United States.--Mathematics

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Principles of comedy and dramatic effect

The dramatists.--Comedy.--Burlesque.--The French stage.--Actors, past and present.--The actors of the day.--The music hall question.--Postscript.--Appendix

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Prefaces to Fiction

This book was converted from its physical edition to the digital format by a community of volunteers. You may find it for free on the web. Purchase of the Kindle edition includes wireless delivery.

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Critiques and Addresses

Thomas Henry Huxley PC, FRS (1825-1895) was an English biologist. He was instrumental in developing scientific education in Britain, and fought against the more extreme versions of religious tradition. He had little schooling, and taught himself almost everything he knew. Remarkably, he became perhaps the finest comparative anatomist of the second half of the nineteenth century. He worked first on invertebrates, clarifying the relationships between groups that were previously little understood. Later, he worked more on vertebrates, especially on the relationship between man and the apes. Another of his important conclusions was that birds evolved from dinosaurs, namely, small carnivorous theropods. This view is widely held today. The tendency has been for this fine anatomical work to be overshadowed by his energetic controversial activity in favour of evolution, and by his extensive public work on scientific education, both of which had significant effect on society in Britain and elsewhere.

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The human figure

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Chemical and geological essays

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