The great World War was more than two-thirds over when America entered the struggle, and yet in a sense this country was in the war from its very beginning. Three great inventions controlled the character of the fighting and made it different from any other the world has ever seen. These three inventions were American. The submarine was our invention; it carried the war into the sea. The airplane was an American invention; it carried the war into the sky. We invented the machine-gun; it drove...

"The reader is requested to observe, that, though the plan of this work is entirely his own, the compiler of it does not put it forth as in any way original in respect to language or description. It is, in fact, a much better book, than if it had been what is strictly called original, (which, indeed, must have involved an utter impossibility:) for it is a selection of some of the best materials the British Museum could furnish; sometimes worked up in his own language; and sometimes—and, ind...

The audacity of my enterprise really consists in my attempting to act according to this general truth in a particular case — the case, that is, of the phenomena of animal life. I have gone on the assumption that knowledge of animal chemistry, for example, at one extreme, and of human consciousness at the other, would be simple blanks as to meaning but for the relation of the two knowledges to each other and to still more general knowledge of animal life.

Could we imagine a chimpanzee poss...

For both the mummified body and the spiritual elements which had inhabited it upon earth had to be protected from a multitude of devils and fiends, and from the powers of darkness generally. These powers of evil had hideous and terrifying shapes and forms, and their haunts were well known, for they infested the region through which the road of the dead lay when passing from this world to the Kingdom of Osiris. The "great gods" were afraid of them, and were obliged to protect themselves by the...

These additions have been incorporated in the following translation. As a basis for the analysis of our intuition of space, Professor Hilbert commences his discussion by considering three systems of things which he calls points, straight lines, and planes, and sets up a system of axioms connecting these elements in their mutual relations. The purpose of his investigations is to discuss systematically the relations of these axioms to one another and also the bearing of each upon the logical de...

This Book presents a course in elementary mathematics adapted to the needs of students in the freshman year of an ordinary college or technical school course, and of students in the first year of a junior college. The material of the text includes the essential and vital features of the work commonly covered in the past in separate courses in college algebra, trigonometry, and analytical geometry.

The fundamental idea of the development is to emphasize the fact that mathematics cannot be ar...

In the following book, constant references to the original historians have been added, in order to make the work serve, not only as a popular history, but also as an index for scholars who may be more familiar with classic literature than with the Byzantine writers.

The Constantinopolitan era places the birth of Christ in the year 5509, and commences on the 1st September. Thus the 31st August, of the first year of the Christian era, is the last day of the year 5508 of the Constantinopolitan e...

Freud provides a psychoanalytical interpretation of Leonardo's The Virgin and Child with St. Anne. According to Freud, the Virgin's garment reveals a vulture when viewed sideways. Freud claimed that this was a manifestation of a "passive homosexual" childhood fantasy that Leonardo wrote about in the Codex Atlanticus, in which he recounts being attacked as an infant in his crib by the tail of a vulture. He translated the passage thus:

It seems uranous and rose are the love of my life and that ...

It is believed by the author that a classification and presentation of selected groups of the devices produced in the past by which it was by the inventor believed, self-motive power had been attained, will save much work in fields already thoroughly exploited.

So far as the author knows no book on the subject has appeared since 1870. The various encyclopedias published contain articles on the subject, but they are necessarily brief, and not satisfying to young men who have become interested ...

It is intended to have the first sixteen pages of this book simply read in the class, with such running comment and discussion as may be useful to help the beginner catch the spirit of the subject-matter, and not leave him to the mere letter of dry definitions. In like manner, the definitions at the beginning of each Book should be read and discussed in the recitation room.

There is a decided advantage in having the de_nitions for each Book in a single group so that they can be included in on...