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absolute aether appears assertion assumption atomic theory atomo-mechanical theory attributes bodies chapter chemical chemical affinity conceive concept conservation of energy constant constitution curvature definite Descartes determined dimensions discussion doctrine elastic elements ence equal evolution existence experience explanation extension fact force gases geometry gravity heat ical impact inertia infinite intellect J. S. Mill kinetic theory light logical luminiferous aether mass and motion material mathematical matter mechanical theory ment metaphysical molecular molecules mutual nature nebular hypothesis Newton object observation ontological orbital ordinary P. G. Tait particles phenomena physical action physical science physicists planet planetary present principle Professor properties proposition pseudo-spherical quantity question reality reason reference relations respecting rest Riemann rotation says scientific sensation sense sensible simple solid space supposed things thought tion true truth ultimate universe Unseen Universe validity velocity vis viva volume weight wholly
Page 110 - But to derive two or three general principles of motion from phaenomena, and afterwards to tell us how the properties and actions of all corporeal things follow from those manifest principles, would be a very great step in philosophy, though the causes of those principles were not yet discovered. And therefore I scruple not to propose the principles of motion above mentioned, they being of very general extent, and leave their causes to be found out.
Page 54 - That gravity should be innate, inherent and essential to matter, so that one body may act upon another at a distance through a vacuum, without the mediation of anything else by and through which their action and force may be conveyed from one to another, is to me so great an absurdity, that I believe no man who has in philosophical matters a competent faculty of thinking can ever fall into it.
Page 321 - His observations are made principally upon ants because they show more power and flexibility of mind ; and the value of his studies is that they belong to the department of original research." " We have no hesitation in saying that the author has presented us with the most valuable series of observations on a special subject that has ever been produced, charmingly written, full of logical deductions, and, when we consider his multitudinous engagements, a remarkable illustration of economy of time....
Page 319 - An attempt made, with much ability and no small measure of success, to trace the origin and development of the myth. The author has pursued his inquiry with much patience and ingenuity, and has produced a very readable and luminous treatise."— Philadelphia North American.
Page 1 - Professor of Astronomy in the College of New Jersey. With numerous Illustrations. $2.00. New York : D. APPLETON & CO., 1, 3, & 5 Bond Street.