I consider philosophy rather than arts and write not concerning manual but natural powers, and consider chiefly those things which relate to gravity, levity, elastic force, the resistance of fluids, and the like forces, whether attractive or impulsive; and therefore I offer this work as the mathematical principles of philosophy.In the third book I give an example of this in the explication of the System of the World. I derive from celestial phenomena the forces of gravity with which bodies tend to the sun and other planets.

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CHECKS, MONEY ORDERS, DISCOVER CARD AND PAYPAL accepted upon request. Visa and Mastercard are default methods for purchases. Shipping/ handling costs are: Media mail $4.25 for 1st book and $1.00 for each other book. PRIORITY MAIL for books up to 2 pounds;$7.75 for 1st book and $4.00 for each other book. We will contact you with a quote for the shipping costs if the book is over 2 pounds. We ship Internationally. We will give a price quote for shipping either FIRST-CLASS INTERNATIONAL or PRIORITY...

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