“To all matter we attribute two properties, gravitation and inertia. Without these two matter cannot exist. {{w|Newton's law of universal gravitation|The greatest of the natural laws states that the power of gravitational attraction is proportional to the mass of the body. This law of Newton}}, almost neglected in the thoughts of {{w|physicist}}s, undoubtedly has vast import of the very deepest meaning. Shall it mean that all matter is finally constructed of uniform and similar primordial atoms or can we find some other explanation?”