A mechanism, the action of on kites, 345; on sails, 346. Windmills, 375. Window, oval, in ear, 272; round, in ear, 272; round, 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; yellow, in eye, 251; yellow, in eye, 251; yellow, in eye, 251; yellow, in eye, 251. Zech, Jacob, 414. Zeiss field-glasses, 260. THE END. *** END OF THE INTERNATIONAL. BY JOHN TYNDALL, F.R.S. LONDON: PRINTED BY SPOTTISWOODE AND CO, NEW-STREET SQUARE AND PARLIAMENT STREET SIXTH EDITION. TO AVOID unwieldiness of bulk.