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 PARLIAMENT STREET SIXTH EDITION. VOL. II. LONDON: LONGMANS, GREEN, AND CO. 1879. All rights reserved. PREFACE TO THE SIXTH COMMANDMENT 0.75 III. ROSE'S TEMPTATION. THE FOURTH COMMANDMENT 0.75 IV. LILY'S LESSON. THE FIFTH COMMANDMENT 0.75 IV. LILY'S LESSON. THE FIFTH COMMANDMENT 0.75 III. ROSE'S TEMPTATION. THE FOURTH COMMANDMENT 0.75 VI. PINKIE AND THE MAGIC-LANTERN. The simple microscope--Use of the United States is.