Copy letter from William Musgrave, New College Oxford, to Francis Aston ' With the Discourse of Dr Garden about the Aerostatical Hypothesis etc. ' ' The inclosed was communicated to us by Dr Middleton of Aberdeen, it was written by Dr Garden a Minister in Aberdeen, to his friend Mr Scougall; as soon as you have done with it, I desire you would return it. ' 8 April 1685