Lectures and Essays by the Late William Kingdon Clifford, F.R.S., 第 1 巻

absolutely action aggregate Algiers angles atoms belongs body called character Clifford consciousness consider consists continuous definite Democritus direction distance distinct earth elementary flatness equal ether Euclid exact exactly exist experience explain fact feelings gases geodesic geometry hand Herbert Spencer hydrogen hypothesis ideas imagine infinite instant J. S. Mill knowledge lecture light liquid luminiferous ether mathematical matter mean mind molecules motion move N₁ nature nitrogen observe organism oxygen particles perceive perception physical planet position possible postulate present pressure properties quantity question rates of vibration reason retina round scientific thought sensation Sétif side solar system solid space speculation Spinoza statement straight lines strings structure suppose supposition surface temperature theory things tion triangle Trilobites Trinity College true universe Unseen Universe velocity vessel whole WILLIAM KINGDON CLIFFORD word