Maech 3, 1911] 



SCIENCE 



333 



terred translators. The cost of adequate 

 production raight deter publishers. Most of 

 those who need a book of this kind would pre- 

 fer to use the original. 



The publishers of the book have used a thin, 

 tough, opaque paper and a close clear type, 

 thus bringing into one volume of readable 

 size matter which with other paper and type 

 would fill two volumes. The diagrams and 

 particularly the colored spectra plates are very 

 fine. The price of the book is comparatively 



^^^y ^°^- E. Eenouf 



Sewage. By A. Peescott Folwell. Sixth 



Edition. 8vo, pp. 506, cloth. New York, 



John Wiley & Sons. $3.00. 



The first 358 pages of this new edition are 

 devoted to detailed descriptions and directions 

 for the design, construction and maintenance 

 of sewers and their various appurtenances, as 

 used for the removal of those wastes that are 

 conveyed from the household by water-car- 

 riage in underground channels. The book is 

 a comprehensive one in this respect, serving 

 not only as a useful guide to the student in 

 sanitary engineering, but also as a valuable 

 reference book to the practical engineer and 

 the sanitarian. 



Specifications, forms of contract and pro- 

 cedures for putting such work under contract 

 are given in a manner to engage the attention 

 of the city official. Cost data are analyzed 

 with much detail and should prove of interest 

 to engineers and contractors. 



Since the first edition of this book appeared 

 eleven years ago, there have been a number of 

 features which have arisen for discussion, and 

 these have been judiciously embodied in the 

 sixth edition. Erom the strictly engineering 

 standpoint, they relate particularly to the use 

 made of concrete. 



The chapters on the ventilation and flush- 

 ing of sewers are well prepared. They wisely 

 advocate the construction and operation of 

 sewers so as to keep as fresh as possible both 

 the sewage itself and the air within the sew- 

 ers. The importance of guarding against 

 putrefaction in sewers and sewer-connections 



is becoming more and more appreciated, par- 

 ticularly by those who have to do with sewage 

 purification. It is gratifying to note that the 

 old idea of trapping the main house drains is 

 not favored, but preference is given to venti- 

 lating the street sewers through the house 

 connections with pipes extending to above the 

 roofs, as is the custom on the continent of 

 Europe. The discussion of this subject should 

 prove of interest to sanitarians. 



Pages 359^92 are devoted to the subject of 

 sewage disposal and have been practically re- 

 written. All the principal aspects of sewage 

 disposal by dilution and by treatment in works 

 of artificial construction of various types are 

 well outlined. The book is not intended to be 

 an exhaustive treatise on sewage disposal, but 

 it is a well-balanced review of the subject 

 which will prove serviceable to students in 

 sanitary science, as well as to health officers, 

 city officials or others interested in the gen- 

 eral subject. 



The book has been brought well up to date, 

 as is shown by the statements given with re- 

 spect to the Emscher tanks for the clarifica- 

 tion of sewage as recently practised in west- 

 ern Germany with a marked degree of suc- 

 cess, showing much improvement over the so- 

 called " septic tanks." 



The point of view that prevails generally 

 throughout the closing chapters of the book is 

 a practical one. Experiences with sewage dis- 

 posal on a large scale are used frequently in 

 illustrating methods and processes. 



Without doubt, the enlarged edition of this 

 book should prove very useful in the class- 

 room and in the library of those who are in- 

 terested in the advancement of sanitary sci- 

 ence. The book is well edited and indexed, 

 and it contains 46 illustrations and 31 tables. 



The arrangement of the book for class-room 

 use will doubtless appeal to teachers, as it 

 shows the results of Professor Eolwell's suc- 

 cessful experience for some years as head of 

 the department of civil engineering of La- 

 fayette College, prior to his taking the editor- 

 ship of the Municipal Journal and Engineer. 

 Geo. W. Euller 



