345; on sails, 346. Windmills, 375. Window, oval, in ear, 272; round, in ear, 272. Wireless telegraphy, 137; advance of, 145; receiver, 140, 141; syntonic, 143; transmitter, 138, _139_. Yale lock, _436_, _437_. Yellow spot, in eye, 251. Zech, Jacob, 414. Zeiss field-glasses, 260. THE END. 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 THE LATE MR. COOPER.--HIS LAST DAYS. A LETTER TO THE ETEXT OR ANY MEDIUM IT MAY BE ON, INCLUDING BUT NOT.