INTRODUCTION 17

the Institute of France, by Charles Ravaisson-Mollien; the Trivulzio Codex, by Luca Beltrami; the Codex on the Flight of Birds and Anatomy A, by Teodoro Sabachnikoff; while the great Codex Atlanticus is currently in press, of which nearly 1000 large folio pages have already appeared, with 920 heliotype heliotype: an early photomechanical process used for high-quality reproduction of drawings plates which reproduce more than 1200 original drawings (5).

There remain a number of unpublished sheets, scattered here and there, the continuation of the great collection of the Royal Library at Windsor, the volumes of the British Museum and the South Kensington Museum Now the Victoria and Albert Museum in London, a total of more than 1500 pages!

The publication of this treasure of science was promised by Teodoro Sabachnikoff in his preface to the Codex on the Flight of Birds (6), and this promise will be kept. The other volumes of the Windsor manuscripts will follow this one, and simultaneously, or following those, we will provide those of the British Museum and those of the South Kensington Museum.

(5) Codex Atlanticus original: "Codice Atlantico" of Leonardo da Vinci... reproduced and published by the Royal Academy of the Lincei The oldest science academy in Italy: — Diplomatic and critical transcription by G. Piumati. — Milan, Hoepli, Publisher.
(6) Codex on the Flight of Birds (aforementioned) page 12.