Hard as it is to believe, what is possibly Galileo's most important Latin manuscript was not transcribed for the National Edition of his works and so has remained hidden from scholars for centuries. In this volume William A. Wallace translates the logical treatises contained in that manuscript and makes them intelligible to the modern reader. He prefaces his translation with a lengthy introduction describing the contents of the manuscript, the sources from which it derives, its dating, and how it relates to Galileo's other Pisan writings. The translation is accompanied by extensive notes and commentary; these explain the text and tie it to the fuller exposition of Galileo's logical methodology in the author's companion volume, Galileo's Logic of Discovery and Proof .
The result is a research tool that is indispensable for anyone intent on understanding Galileo's logic as described in that volume and the documentary evidence on which it is based.

Inhalt
Description of MS 27.- Galileo's Sources: Manuscripts or Printed Works?.- Vallius and Carbone.- Possible Sources of MS 27.- Vallius as the Source of MS 27.- The Time and Place of Composition of MS 27.- MS 46: The Physical Questions.- The Problem of Dating MS 46.- MS 71: The De motu Treatises.- Additional Sources.- The Relationship of MS 27 to Galileo's Science.- Notes.- Treatise on Foreknowledges and Foreknowns.- F2 Second Disputation: On Foreknowledges of Principles.- F3 Third Disputation: On Foreknowledges [of the Subject].- F4 Last Disputation: On Foreknowledges of the Property and of the Conclusion.- Notes and Commentary.- Treatise on Demonstration.- D1 First Disputation: On the Nature and Importance of Demonstration.- D2 Second Disputation: On the Properties of Demonstration.- D3 Third Disputation: On the Species of Demonstration.- Notes and Commentary.- Biographical and Bibliographical Register.- Concordance of English and Latin Editions.- Index of Terms.- Index of Names.