FIRST VOLUME. LONDON: PRINTED BY SPOTTISWOODE AND CO, NEW-STREET SQUARE AND PARLIAMENT STREET SIXTH EDITION, VOL. 1. LONDON: LONGMANS, GREEN, AND CO. 1879. All rights reserved. PREFACE TO THE COLOUR AND CHEMICAL CONSTITUTION OF BODIES. IV. NEW CHEMICAL REACTIONS PRODUCED BY LIGHT. 1. DECOMPOSITION BY LIGHT. Physical Considerations. I sought to turn millstones, throw shuttles, work saws and hammers, and drive.