16 Mr. Edward Arnold's Autumn Announcements 
between elementary books and specialized works on advanced 
electrical engineering. Second and third year students will here finda 
book dealing with the broad principles of electrical machinery without 
entering into all the details of its practical construction and design. 
In thoroughly revising the book for a second edition, the translator 
has further added several valuable sections on the rise of tempera- 
ture of electric motors under continuous and intermittent loads, on 
the Rosenberg constant-current variable-speed dynamo, and on 
six-phase rotary converters. 
AN INTRODUCTION TO 
THE THEORY OF OPTICS. 
By ARTHUR SCHUSTER, Pu.D., Sc.D. F.RS, 
Honorary PRoFessor oF Puysics AT THE UNIVERSITY OF MANCHESTER, 
Second Edition. With 180 Illustvations. Demy 8vo., cloth. 15s. net. 
The second edition of Prof. Schuster’s introduction to the study of 
the advanced theory of optics has had the advantage of complete 
and thorough revision by the author. Among the new matter added 
may be especially mentioned the fuller account of Michelson’s and 
other methods for the absolute determination of wave-lengths, and 
the direct comparison of the lengths so determined with the French 
standard metre. 
ELEMENTARY PHYSIOLOGY 
FOR TEACHERS AND STUDENTS. 
By W. B. DRUMMOND, M.B., C.M., F.R.C.P.E., 
MeEbICAL OFFICER AND LECTURER ON HvYGIKNE TO THE EDINBURGH PRovINCIAL COMMITTEE 
FOR TRAINING TEACHERS, 
AuTHoR oF ‘AN INTRODUCTION TO CHILD STupy,’ ETC. 
With Illustrations. Crown 8vo., cloth. 2s. 6d. 
This work differs from the usual type of text-book on Elementary 
Anatomy and Physiology in several important particulars. In the first 
place special reference is made throughout the book to the differences 
between children and grown people. For example, there are special 
sections dealing with the diet of children, with the peculiarities of 
the child’s skeleton, and with the nervous system in childhood. 
In the second place, those organs and systems are described most 
fully which are of special importance in reference to the care of 
children. Thus, the skeleton and muscles are described in greater 
detail than usual in works of the same size in reference to physical 
training. The effect of exercise on the different organs of the body 
is discussed. Considerable space, as might be expected in a book 
intended for teachers, is devoted to the nervous system. 
Lastly, while the work does not deal directly with either hygiene 
or education, the bearing of physiology on these subjects has been 
kept in view throughout. 
LONDON: EDWARD ARNOLD, 41 & 43 MADDOX STREET, W. 
