This informational work explains the relation of physics to other branches of science. In describing this complex subject, the writer used simple language, avoiding any technicalities for the readers to grasp information quickly. A must-read for science enthusiasts. Contents include: The Electromagnetic Ether The Atom of Electricity Inertia and Radiation Dynamics of the Electron Electromagnetic Dynamics Cathode Rays Positive Electrons — α Rays Theory of Matter. Radioactivity Electric Properties Magnetic Properties Conclusion