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 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...

Great Expectations is Charles Dickens's thirteenth novel. It is his second novel, after David Copperfield, to be fully narrated in the first person. Great Expectations is abildungsroman, or a coming-of-age novel, and it is a classic work of Victorian literature. It depicts the growth and personal development of an orphan named Pip. The novel was first published in serial form in Dickens' weekly periodical All the Year Round, from 1 December 1860 to August 1861. In October 1861, Chapman and Ha...

The book has been written for college Freshmen, and, as its title implies, it is intended to serve as an introduction to general chemistry. In consequence we have aimed to present a continuous and connected story in teachable form and have not attempted to give extensive descriptive and numerical data where such matter is of little interest to the student or is not needed for the development of important principles.

Inasmuch as the choice and arrangement of topics in the earlier part of this...

Oliver Cromwell (1599 – 1658) was an English military and political leader and later Lord Protector of the Commonwealth of England, Scotland and Ireland. Born into the middle gentry, Cromwell was relatively obscure for the first 40 years of his life. After undergoing a religious conversion in the 1630s, he became an independent puritan, taking a generally tolerant view towards the many Protestant sects of his period.

An intensely religious man—a self-styled Puritan Moses—he fervently be...

Art, with its finite means, cannot hope to record the infinite variety and complexity of Nature, and so contents itself with a partial statement, addressing this to the imagination for the full and perfect meaning. This inadequation, and the artificial adjustments which it involves, are tolerated by right of what is known as artistic convention; and as each art has its own particular limitations, so each has its own particular conventions. Sculpture reproduces the forms of Nature, but discard...

David Ames Wells (1828-1898), a prominent American financial economist, political activist and apostle of laissez faire, was a staunch advocate of free trade and the abolition of the tariff. "Wells wrote a large number of books, pamphlets, and articles …

His chief interests were the tariff, the theory of money and the currency question, and taxation. His discussion of all of these took character from his inspection of American economic life, which was marked in his period by progressive lo...