v. 1 Euclid. The elements. Archimedes. On floating bodies, and other propositions. N. Copernicus. On the revolutions of the heavenly spheres. I. Newton. Principia. A. Einstein. Relativity, the special and general theory.--v. 2. Galileo. Dialogues concerning two new sciences. J. Dalton. The atomic theory. M. Faraday. Experimental researches in electricity. D. Mendeleyev. The periodic law. M. Curie. Radioactivity.--v. 3. C. Lyle. Principles of geology. C. Darwin. The origin of species. G. Mendel. Experiments in plant-hybridization.