Paper, 'De motu corporum ex mutuo impulsu' ['On the motion of bodies resulting from impact'] by [Christian] Huygens This tract by Huygens presents his theory on the motion of bodies resulting from impact. A summary account was printed in 'Philosophical Transactions' and in Journal des Sçavans (18 March 1669), 13-24. Includes figures in the text. Subject: Mechanics Summary account published in Philosophical Transactions as 'A summary account of the laws of motion, communicated by Mr. Christian Hugens in a letter to the R. Society, and since printed in French in the Journal des Scavans of March 18. 1669. st. n'. Read to the Royal Society on 7 January 1669. [1668]