REVIEWS 375 



not included in place of the second part of the work. The subject is so closely 

 allied to the separation of mixtures. There are one or two books dealing with 

 quantitative determination, but there is room for a complete work on the elementary 

 methods of organic analysis. In its present form, however, it should be of service 

 to the examination student. H. S. S. 



The Control of Water as applied to Irrigation, Power, and Town Water 



Supply Purposes. By Philip A. Morley Parker. [Pp. vi + 1055, with 



full diagrammatic illustrations.] (London : George Routledge & Sons, Ltd., 



1913. Price 21s. net.) 



Although the title of this book is -almost alarming in its comprehensiveness, it 



is only fair to say that in this closely printed volume of more than one thousand 



pages, a fairly successful attempt is made to produce a manual covering all the 



ground which is generally necessary for engineers in practical work ; and the 



author certainly displays both judgment and industry in the collection and 



arrangement of his material. 



The book presupposes the usual training that any educated engineer receives 

 at the present time in the subject of hydraulics at a technical school or college ; and 

 there is a good deal to be said for the view of the writer, that results from well- 

 conducted observations are more accurate than the assumptions made in most 

 modern mathematical treatments of hydraulics : indeed the author might have 

 gone farther and said that there is no really accurate and scientific basis of 

 practical hydraulics since there is practically no such thing as steady motion in a 

 large number of the most important cases with which the hydraulic engineer has 

 to deal. 



The subjects of critical velocities, capillary elevation, and velocity of percolation 

 dealt with in the second chapter are well treated. In the third chapter the 

 gauging of streams and rivers shows that the author himself has practical 

 acquaintance with the subject, although he does not deal with one or two of the 

 best modern meters. 



Pressure tubes are clearly treated : and the modern methods of chemical 

 gauging are more fully dealt with than anywhere else, although it is doubtful if such 

 methods would be allowed in many waters. 



The theory of Venturi meter and results with it are also well treated. It is of 

 course impossible in the space available to comment at length on the various 

 chapters which deal with the questions of Gauging by Weirs, Discharge of 

 Orifices, Dams and Reservoirs, Pipes, Open Channels, Filtration and Purification 

 of Water, Problems connected with Town Water Supply, Irrigation, Movable Dams, 

 Hydraulic Machinery other than Turbines, Turbines and Centrifugal Pumps : 

 concluding with the chapter on Concrete, Ironwork, and Allied Hydraulic 

 Construction ; but it may be said that the treatise is worthy to take its place as a 

 standard one among the literature of water supply. 



Wireless Telegraphy. By C. L. Fortescue, M.A. [Pp. vi+143.] (Cambridge: 



at the University Press, 1913. Price is.) 

 This little book is written for readers possessing general scientific knowledge 

 who may be anxious to know something about both the accomplishments of wireless 

 telegraphy and the means by which results have been obtained. 



The first four chapters are devoted to explanations of the electrical phenomena 

 concerned, and the last seven to a general survey of the applications of wireless 

 telegraphy. 



