﻿526 JVotices respecting JS r ew Books. 



subject, and of the principles of electric-wave telegraphy. This 

 concluding part will more particularly appeal to those interested 

 in the purely technical aspects of the subject. There are three 

 appendices, the first of which contains the Wireless Telegraphy Act 

 of 1904, the second bibliographical references, and the third a list 

 of British patents relating to wireless telegraphy. 



Throughout the entire work, there are numerous references to 

 original sources of information, and the accounts of experimental 

 researches having a direct or indirect bearing on the subject under 

 treatment are so complete that the work mny well be regarded as 

 an encyclopaedic one. Its preparation must have involved an 

 immense amount of labour, and it will undoubtedly rank as the 

 standard treatise on the subject for some time to come. From 

 another point of view, perhaps, the very wealth of the information 

 contained in the book is liable to prove somewhat perplexing to 

 the reader who approaches the subject with only a slight knowledge 

 of its scientific principles. There are a number of minor blemishes, 

 but most of those which have come under our notice are either 

 obvious printer's errors or the result of hasty writing. The book 

 is beautifully printed and well and lavishly illustrated. 



Anleitung zu WissenscJiaftlichen Beobaclitungen auf Reisen. Heraus- 

 gegeben von Dr. Gr. von Neumatee, Wirklicher Geiheimer Eat. 

 Dritte vollig umgearbeitete nnd vermehrte Aufiage in zwei 

 Eanden, mit zahlreichen Holzschnitten, photographischen Ab- 

 driicken und zwei lithographierten Tafeln. Hannover : Dr. 

 Max Janecke. 1906. Vol. I., pp. xxiv+844; Vol.11, pp. xxvi 

 + 880. 



A brief notice of the Introductory portions of this important 

 standard work has already appeared in these columns, and now 

 the work has reached completion. It is by more than 30 authors, 

 each of whom is an acknowledged specialist in the particular subject 

 on which he writes. The names of the various authors are in 

 themselves a sufficient guarantee that the information contained in 

 the book is thoroughly trustworthy and up-to-date, and there is no 

 other publication which for completeness can compare with this 

 " explorer's encyclopaedia." 



Vol. I. deals with the determination of latitude and longitude, 

 route surveying, geology, earthquakes, the earth's magnetic field, 

 meteorology, oceanography, and astronomical observations, and 

 contains general hints regarding the fitting out and conduct of a 

 scientific expedition. Vol. II. deals with anthropological and 

 ethnographical investigations, the study of diseases, agriculture, 

 the collection of cultivated plants, plant geography, the geogra- 

 phical distribution of animals, botanical and zoological collections. 



The directions contained in the book are clear and explicit, and 

 the lists of questions given in many sections should go a long way 



