In the Philosophical Transactions for 1669 it is recorded that the society, being interested in the laws of the principles of motion, a request was made that M.
Huygens, Dr.Wallis, and Sir Christopher Wren submit their views on the subject.

Wallis submitted his paper first, November 15, 1668.

A month later, December 17th, Wren imparted to the society his laws as to the nature of the collision of bodies.

And a few days later, January 5, 1669, Huygens sent in his "Rules Concerning the Motion of Bodies after Mutual Impulse." Although Huygens's report was received last, he was anticipated by such a brief space of time, and his views are so clearly stated--on the whole rather more so than those of the other two--that we give them in part here: "1.

If a hard body should strike against a body equally hard at rest, after contact the former will rest and the latter acquire a velocity equal to that of the moving body.
"2.