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finally how incomplete all their teachings. One more objection and I have done. They teach that all the physical forces rejoicing in specific names such as gravity, inertia, cohesion, light, heat, electricity, magnetism, chemical affinity, are convertible one into another? If so the force producing must cease to be as the force produced becomes manifest. "A flying cannon ball moves only from its own inherent force of inertia." When it strikes it produces heat and other effects but its force of inertia is not the least diminished. It will require as much energy to start it again at the same velocity as it did at first. We may repeat the process a thousand times and as long as the quantity of matter