Several years ago there was published in Rome a salutary edict which, in order to obviaie the dangerous tendencies of our present age, imposed a seasonable silence upon the Pythagorean opinion that the earth moves There were those who impudently asserted that this decree had its origin not injudicious inquire, but in passion none too […]

Considering (Most Serene Prince) that the publishing this present Treatise, of so different an Argument from that which many expect, and which according to the intentions I proposed in my [A] Astronomicall Advisor, I should before this time have put forth, might peradventure make some thinke, either that I had wholly relinquished my farther imployment […]

The Mathematical Principles of Natural Philosophy – English Translated version of Philosophiae Naturalis Principia Mathematica by Sir Isaac Newton THAT the PRINCIPIA of Newton should have remained so generally unknown in this country to the present day is a somewhat remarkable fact ; because the name of the author, learned with the very elements of […]

On the Origin of Species By Means of Natural Selection, or, the Preservation of Favored Races in the Struggle for Life. When on board H.M.S. ‘Beagle,’ as naturalist, I was much struck with certain facts in the distribution of the inhabitants of South America, and in the geological relations of the present to the past […]

I have stated in the preface to the first Edition of this work, and in the “Zoology of the Voyage of the Beagle,” that it was in consequence of a wish expressed by Captain Fitz Roy, of having some scientific person on board, accompanied by an offer from him of giving up part of his […]

The annual labour of every nation is the fund which originally supplies it with all the necessaries and conveniencies of life which it annually consumes, and which consist always either in the immediate produce of that labour, or in what is purchased with that produce from other nations. According, therefore, as this produce, or what […]

To say that we live in an age of science is a common- place, but like most commonplaces it is only partially true. From the point of view of our predecessors, if they could view our society, we should, no doubt, appear to be very scientific, but from the point of view of our successors […]

It gives me great pleasure to accept the invitation of the publishers to write a word of introduction for Mr. Rahn’s excellent translation of “Der Kluge Hans”, a book which in the original has been but little known to American readers. The present wave of interest in animal life and behavior renders its appearance peculiarly […]

Few, especially in this country, realize that while Freudian themes have rarely found a place on the programs of the American Psychological Association, they have attracted great and growing attention and found frequent elaboration by students of literature, history, biography, sociology, morals and aesthetics, anthropology, education, and religion. They have given the world a new […]

The same volume I published an essay on Scientific Humanism (a close approximation to P£re Teilhard’s Neo-Humanism) f in which I independently anticipated the tide of Pere Teilhard’s great book by describing humanity as a phenomenon, to be studied and analysed by scientific methods. Soon after the first World War, in Essays of a Biologist, […]