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Elementary Class-Books — continued. formulœ and all troublesome details of calculation.” The speciality of this volume is the direct reference of every step to the Observatory, and the full description of the methods and instruments of observation.

The author has here aimed to give a connected view of the whole subject, and to supply facts, and ideas founded on the facts, to serve as a basis for ''subsequent study and discussion. The chapters treat of the Stars and'' Nebulœ; the Sun; the Solar System; Apparent Movements of the Heavenly Bodies; the Measurement of Time; Light; the Telescope and Spectroscope; Apparent Places of the Heavenly Bodies; the Real Distances and Dimen&shy;sions; ''Universal Gravitation. The most recent astronomical discoveries'' ''are incorporated. Mr. Lockyer's work supplements that of the Astronomer'' ''Royal mentioned in the previous article. “The book is full, clear, sound,'' and worthy of attention, not only as a popular exposition, but as a scientific ‘Index.’” —. “The most fascinating of elementary books on the Sciences.” —.

This book describes and explains, in a series of graduated lessons, the principles of Human Physiology; or the Structure and Functions of the ''Human Body. The first lesson supplies a general view of the subject.'' This is followed by sections on the Vascular or Venous System, and the Circulation; the Blood and the Lymph; Respiration; Sources of Loss and of Gain to the Blood; the Function of Alimentation; Motion and Locomotion; Sensations and Sensory Organs; the Organ of Sight; the