There is only one auction record of the complete Newton series being sold, which went for $75,600 (approx. £56,000) at Christies 25th April 2022. Our example has the further benefit of the Phil Trans volumes up to 13, which include amongst many others in 1677, Leeuwenhoeck’s sensational article on living beings in water, which he called animalcula (number 133 pages 821-831). The early volumes of Philosophical Transactions are infrequent on the market: they were produced as monthly or bimonthly parts which were sent to Fellows, often irregularly. They were only later bound up either by the Fellows themselves using title pages supplied or by the printer for stock. They therefore had a limited sale at the time, and were often purchased and used for scholarly exchanges by the Royal Society.