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BMJ No 7115 Volume 315 Endpiece Saturday 25 October 1997 Endpiece Alternative definitions Gravitation: The tendency of all bodies to approach one another with a strength proportional to the quantity of matter they contain - the quantity of matter they contain being ascertained by their tendency to approach one another. This is an illustration of how science, having made A the proof of B, makes B the proof of A. Ambrose Bierce, The Cynic's Word Book (1906), subsequently titled The Devil's Dictionary Home | Current issue | Past issues | Classified ads | Career Focus | Feedback Collections | About this site | About the BMJ | BMA | Medline