Copy letter from Alexis Claude Clairaut, Paris, to the Royal Society ' Recherches sur la figure des Planetes qui tournent autours de leur Axes, en suppesant que leur Densite varie du Centre a la Surface. ' Includes one page of seven mathematical figures, printed in Philosophical TRansactions No 449 Table 1 Read by the President at the Royal Society on 26 October 1738 1738