394 REVIEWS. 



energy developed within and from a discharge-tube, the only source of the X 

 rays. The frontispiece to the Look is a fine portrait of Dr. William Konrad 

 Roentgen ; there are also 60 diagrams and 45 half-tone illustrations. 



The ABC of the X Rays. By William H. Meadovvcroft. 



Cr. 8vo, pp. 189. (London: Simpkin, Marshall, and Co.) Price 4/- 



The author aims at assisting two classes of readers : those who desire to 



add to their stock of general information, and those who wish to pursue for 



themselves a line of investigation and experiment in -the fascinating domain of 



these mysterious rays. 



The explanations are plainly given. Information as to choice of apparatus 



is also given. There are 37 illustrations. 



Bromide Enlargements and How to Make Them. By J. 



Pike, pp.64. (Bradford and London : Percy Lund and Co. 1898.) 6d. 



No. 13 of Lund's Popular Photographic Series treats in a thorough manner 

 of the subject of enlarging. This little book is beautifully printed and well 

 illustrated, and its size — 7^ by 4| in. — makes it convenient for carrying in the 

 breast-pocket. 



Photographic Lenses : How to Choose and How to Use 

 Them. By John A. Hodges. Cr. 8vo, pp. 142. (Bradford and London : 

 Percy Lund and Co, 1897.) Price 2/- 



This book aims to explain, as far as possible without reference to technical 

 terms, the properties and uses of photographic lenses. 



The Photographic Annual, 1897. Edited by Henry 

 Sturmey. 8vo, pp. cxlviii. — 548. (London: Iliffe and Son. 1897.) Price 

 2/6 and 3/6. 



As usual, a vast amount of most useful information, as well as a number of 

 beautiful plates, is here given to us, the various subjects being classified and 

 arranged in their several sections. 



La Chromophotographie sur Plaque fixe et sur Pellicula 

 Mobile. Par Louis Gastine. Cr. 8vo, pp. 172. (Paris : Gauthier-Villars et 

 Fils.) 



Chromo-photography is a method of precisely representing the continuance 

 and succession of movements. Given an object in motion, Chromo-photo- 

 graphy tells how quickly, how far, and how much it moves, and being a system 

 having photography for its base, it must necessarily be a faithful method. 



The system has recently undergone considerable improvements, which are 

 fully described in the little book before us. 



The Process Year-Book, Vol. HL, 1897 : An Illustrated 

 Review of all Photo- Mechanical Processes. 4to, pp. 128. (London: Penrose 

 and Co. ) Price 2/6. 



We have here specimens of every description of Photo-Mechanical Process 

 Work, including Astronomical Photography, all very beautifully executed, 

 together with instructions which cannot fail to prove most useful to the photo- 

 grapher, whether amateur or professional. The full-page plates — of which 

 there are a great number — are very fine, several being printed in colours. 



