The Library of Original Sources: 19th and 20th centuries. Indexes

action angular gyrus animal aphasia atomic weights average cost average price Babylon Babylonian bacteria bacterium become bodies bourgeois bourgeoisie brain capital capitalist cause cells centres character charged chemical companies competition cost of production cubic feet depreciation disease dogs electric elements energy existence experiments fact fluorescence furnished germ-cells germ-plasm Government groups hand idea individual industry inoculated interest labor lamp large number light lines Manila matter means of production ment method mode of production monopoly motor municipal plants native NATURAL SCIENCES nucleoplasm observed organism parthenogenesis periodic law phenomena platinum polar bodies political present private plants productive forces proletariat quantity rabbits rabies railroad railway rates segmentation nucleus society stars substance Tagal temperature theory tion total investment towns trade transmissible trephining tube velocity vibrations VIII virulence virus wages waves whole X-rays