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Scientific papers sent to the Royal Society, many of which were published in the 'Philosophical Transactions'. As the name implies, the series is a combination and continuation of Early Letters and Classified Papers into the 19th century. Later, the sequence divided into Philosophical Transactions and Archived Papers. From the time that the Letters and Papers (or New Guard Books as they were originally known) were created, none of these original papers were copied into Letter or Register Books. Scientists represented include William Herschel (66 papers) William Watson (36 papers) Henry Baker (32 papers) Everard Home (31 papers), William Stukely (30 papers), and John Smeaton (23 papers). As the series progresses, the character of the documents alters - the earlier decades contain larger numbers of short letters, but by the 19th century most of the manuscripts are in the form of long monographs. The texts are supported by a large quantity of original illustrations throughout the series. This collection provides a virtually unbroken run of presentations by leading 18th century scientists; the few gaps include 1746-1749, when no papers were collected. Occasionally such missing items may be located in the archives of other institutions.