Half Hours with Modern Scientists, Svazek 1

action actual energy ammonia analogy animal appear atoms beam blue body brain called carbonic acid cell cerebellum cerebral hemispheres characters chemical chemistry circulatory system Comte condition constituents contractility converted correlation Darwin difference dust electricity ence ether waves evidence exhibited existence fact functions genera genus geologic geological periods germ heat higher human Hume Huxley Huxley's hydrogen hypothesis ical idea identity infinite inorganic intellectual knowledge light lower material Max Schultze mechanical microscope mind molecular molecules Molluscs moral motion muscle muscular nature necessitarianism nitrogen nucleus object organic origin oxygen paleontologist particles period phenomena philosophy Physiology plant plasm possess potential energy preëxisting present probably produced progress proto protoplasm quadrumana qualities question reason regard relation result scientific seen species spirit structure substance syntonin temperature theory things thought tion tissue toplasm tricity truth tube vegetable vital force waves whole word