1891.] MICROSCOPICAL JOURNAL. 47 



ested in that instrument. It was a matter greatly to be regretted that 

 one comprehensive, ably-edited journal like the Journal of the Royal 

 Microscopical Society of London could not be maintained in this coun- 

 try. It had been suggested in the East to incorporate the two monthly 

 journals in the United States with the proceedings of the American 

 Society of Microscopists and endeavor to issue one creditable periodical, 

 but no plan has yet been matured by which the end could be attained. 

 The Vice-President, on behalf of the society, thanked Mr. Smiley for 

 his remarks, which were timely and to the point. 



NOTICES OF BOOKS. 



Die Mikrophotographie ah Hilfsmittel naturxvissenschaftlicher 

 Forschung^ Von Gottlieb Marktanner-Turneretscher. Halle, 

 A. S., Wilhelm Knapp. 1890. Pp. 344, with two plates. 



The title of this excellent work expresses its comprehensive scope as 

 well as its general character. The author is better known in Vienna 

 perhaps than to the microscopists and photographers of the United 

 States, but his ingenious devices for facilitating the opei'ations of photo- 

 micrography are not unknown to the readers of this Jotiriial. The 

 work before us is largely devoted to the description of apparatus for 

 photomicrography. The illustrations are excellent and ^vell chosen. 

 The literatui"e of the subject is well summarized, and scarcely anything 

 of importance has been omitted. It is a meritorious work, reflecting 

 great credit upon the author, and manifesting his painstaking eftbrt to 

 embody the results of the experience and practice of many successful 

 operators within the pages of a single volume. The different important 

 methods of preparing places for negatives and paper for prints are well 

 described, as well as the best methods of manipulation for the produc- 

 tion of negatives and prints. The excellent apparatus of the author for 

 photographing microscopic objects in motion is not only ingenious but 

 eminently practicable. By means of a reflecting prism the light from 

 the object is reflected into a secondary tube with an eye-piece. By look- 

 ing down into this tube the field of view can be examined and at the 

 proper moment the light can be instantaneously thrown upon the sensi- 

 tive plate in the horizontal camera. This device could readily be ap- 

 plied to other forms of apparatus, the important feature being the arrange- 

 ment for making the instantaneous exposure. The writer of this review 

 saw the original instrument devised and successfully used by the author 

 at his home in Vienna two years ago, and was greatly pleased with it 

 at the time. 



Much valuable information is given in the book as a result of the 

 author's long experience, and the work is to be highly recommended as 

 the best and most complete publication on photomicrography we have 

 seen. — R. H. 



The Origin of the Aryans. By Isaac Taylor, M. A., Litt. D. The 

 Humboldt Publishing Co., 28 Lafayette Place, New York. 

 This is an account of the pre-historic ethnology and civilization of 

 Europe. 



