Treatise on ambergris by Caspar Neumann, Professor of Chemistry at Berlin Original document dated 15 October 1729 Details of experiments to determine whether ambergris is animal, vegetable or mineral Read to the Royal Society on 4 June 1730 Printed in 'Philosophical Transactions', in three articles: vol 38, no 433, p 344, no 434, p 371, no 435, p 417 1730