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SUppose an Horse can travel 5 miles an hour with 200 pound burthen on his back; then with half the said burthen he shall travel 7; and with double but three miles and a half. Again, suppose a Horse with 200 pound burthen can endure to tra∣vel 10 hours per diem; then
with half the same burthen he may endure 14 hours, and with double but 7 hours. Lastly, suppose a Horse (as Race-horses) can run after the rate of four miles in ⅛ of an hour, or 32 miles per hour, then they can run about 6 miles 1/28 in ¼, or after the rate of 24 1/7 miles per hour; and in one half an hour can run 8 miles, or after the rate of 16 miles per hour; and in a whole hour can run 12 1/14 miles; and in 2 hours
can run 16 miles, or 8 miles per hour; and in 4 hours can run 24 miles, at 6 miles per hour; and in 8 hours 32, or 4 miles per hour; and in 16 hours may go 48 miles, or 3 miles in an hour. All which agrees well enough with Experience.