3 6 EDUCATIONAL BOOKS. 



sidiary), and the principles, on which the observations made with these 

 instruments are treated for deduction of the distances and weights of the 

 bodies of the Solar System, and of a few stars, omitting all minutue of 

 formula, 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. 



ASTRONOMY. 



MR. LOCKYER'S ELEMENTARY LESSONS IN ASTRO- 

 NOMY. With Coloured Diagram of the Spectra of the Sun, 

 Stars, and Nebulae, and numerous Illustrations. ByJ. NORMAN 

 LOCKYER, F.R.A.S. Fourth Thousand. i8mo. $s. 6d. 



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 

 Nebuhv ; 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- 

 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. 



PHYSIOLOGY. 



PROFESSOR HUXLEY'S LESSONS IN ELEMENTARY 

 PHYSIOLOGY. With numerous Illustrations. By T. H. 

 HUXLEY, F.R.S. Professor of Natural History in the Royal School 

 of Mines. Twelfth Thousand. i8mo. cloth. 4?. 6d. 



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 Veinous 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 



