Einstein has succeeded in separating far more completely than hitherto the share of the observer and the share of external nature in the things we see happen. The perception of an object by an observer depends on his own situation and circumstances; for example, distance will make it appear smaller and dimmer. We make allowance for this almost unconsciously in interpreting what we see. But it now appears that the allowance made for the motion of the observer has hitherto been too crude|a fact...

Philosophiæ Naturalis Principia Mathematica (Latin for Mathematical Principles of Natural Philosophy), often referred to as simply the Principia, is a work in three books by Isaac Newton, in Latin, first published 5 July 1687. After annotating and correcting his personal copy of the first edition, Newton published two further editions, in 1713 and 1726. The Principia states Newton's laws of motion, forming the foundation of classical mechanics; Newton's law of universal gravitation; and a de...

Instructions for the right use of the book:

And herein let me premise a word or two. The Herbs, Plants, &c. are now in the book appropriated to their proper planets. Therefore,

First, Consider what planet causeth the disease; that thou mayest find it in my aforesaid Judgment of Diseases.

TAKE Notice, That in this Edition I have made very many Additions to every sheet in the book: and, also, that those books of mine that are printed of that Letter the small Bibles are printed with, are very fa...

The Republic of Plato is the longest of his works with the exception of the Laws, and is certainly the greatest of them. There are nearer approaches to modern metaphysics in the Philebus and in the Sophist; the Politicus or Statesman is more ideal; the form and institutions of the State are more clearly drawn out in the Laws; as works of art, the Symposium and the Protagoras are of higher excellence. But no other Dialogue of Plato has the same largeness of view and the same perfection of styl...

The whites have assisted greatly in rendering the traditions of the Aborigines more obscure by their own manner of corrupting names. Thus, the term used in the title of this book has undergone the changes of Mahicanni, Mohicans, and Mohegans; the latter being the word commonly used by the whites. When it is remembered that the Dutch (who first settled New York), the English, and the French, all gave appellations to the tribes that dwelt within the country which is the scene of this story, and...

"The Americans" by Hugo Munsterberg stands alongside Alexis de Tocqueville's American Democracy as one of the great works on the New World written by a scholar deeply familiar with the Old World. When originally published, it gave the German public a sense of American life, and was described as "a book which deals in a detailed way with the political, economic, intellectual, and social aspects of American culture." Munsterberg, a world-renowned psychologist at the turn of the twentieth centur...

["The Elements of Drawing" was written during the winter of 1856. The First Edition was published in 1857; the Second followed in the same year, with some additions and slight alterations. The Third Edition consisted of sixth thousand, 1859; seventh thousand, 1860; and eighth thousand, 1861.

The work was partly reproduced in "Our Sketching Club," by the Rev. R. St. John Tyrwhitt, M.A., 1874; with new editions in 1875, 1882, and 1886.

Mr. Ruskin meant, during his tenure of the Slade Professors...

MODERN scientific publications, although they may in some or even many cases equal in their scientific quality the memoirs of earlier workers, do not, on the average, reach a high standard as regards illustration. For instance, in Great Britain botany is pre-eminent in its morphological aspects; it should therefore follow that the illustrations, which form so important a part of such papers, should be beyond reproach.

This is not always so, a fact which must be patent to anyone with the sligh...

THE MAN WHO "THOUGHT" HIS WAY INTO PARTNERSHIP WITH THOMAS A. EDISON

TRULY, "thoughts are things," and powerful things at that, when they are mixed with definiteness of purpose, persistence, and a BURNING DESIRE for their translation into riches, or other material objects.

A little more than thirty years ago, Edwin C. Barnes discovered how true it is that men really do THINK AND GROW RICH. His discovery did not come about at one sitting. It came little by little, beginning with a BURNING D...

This illustrated version of the "Democracy: An American Novel!", First published anonymously, March 1880, and soon in various unauthorized editions. It wasn't until the 1925 edition that Adams was listed as author. Henry Adams remarked (ironically as usual), "The wholesale piracy of Democracy was the single real triumph of my life."—it was very popular, as readers tried to guess who the author was and who the characters really were. Chapters XII and XIII were originally misnumbered.

"..ON t...