Copy letter from William Musgrave, New College Oxford, to Francis Aston ' Of the Canada Ssugar made of the Juice of the Maple. Of the Purpura of Persons killed by the Cold. Of the Urn found at Yorke. Of a Digest in Naturall Philosophy. Of the Bath cureing the Palsy. Of the specifical weights of several Bodys. ' Includes also an 'Account of the weight of severall bodies, which being supported equall in Magnitude differ in Gravity, as the folowing numbers...' 14 March 1685