October, '13] REVIEWS 429' 



must be slighted. There is more or less undesirable duplication of 

 work and overlapping of spheres of activity. These obstacles to the 

 best progress are being gradually overcome, and for the most part it 

 is gratifj'ing to state that they are of minor importance, though note- 

 worthy factors as competition becomes more keen. 



Reviews 



Entomology, with Special Reference to its Biological and Economic 

 Aspects, by J. W. Folsom. Second revised edition, pages 402, plates 

 4, text figures 304. Blakiston Sons & Co. 1913. 



The new edition of this standard work has been reset and thoroughly revised. 

 Much new matter has been incorporated here and there, the most important being 

 a chapter on the transmission of diseases by insects. There are several new figures, 

 others have been improved, and over 100 titles added to the well selected and exten- 

 sive bibliography. The slightly larger pages and thinner paper have effected a 

 desirable reduction in thickness and weight. The colored plate of the first edition is 

 omitted in the revision, and the same is true of a chapter on origin of adaptations 

 and species. ^ 



We have in this volume an admirable" summary of the fundamentals of insect 

 biology and ecology, with special reference to the economic applications. It is an 

 invaluable supplement to our somewhat numerous taxonomic works. Familiarity 

 with its contents is one of the best possible preparations for the economic entomolo- 

 gist, the man who is primarily concerned in ascertaining biological relationships. 

 This edition, price $2.25, should be in the library of every working entomologist. 



The Reduction of Domestic Flies, by Edward Halford Ross. 103^ 

 pages, 18 illustrations; J. B. Lippincott Company, Philadelphia, 

 and John Murray, London. 1913. Net, SI. 50. 



This volume is a companion to the aiithor's "The Reduction of Domestic Mosqui- 

 toes" which appeared a year or more ago. It is written by an Englishman and from 

 an English standpoint. The book contains twelve chapters with titles as foUows: 

 "The Importance of Domestic Flies; The Fly-Egg, the Larva, and the Chrysalis; 

 The Life and Habits of Domestic Flies; The Fly's Enemies; How to Reduce Flies; 

 The Beginning of the Anti-Fly Campaign; Early Fly Reduction; The Organized Anti- 

 Fly Campaign; Opposition; The Justification of Expenditure of Money and Energy; 

 The Life and Death of Worry the Fly; Sanitary Education, Flies, and the Coming 

 Generation." 



This book is not without faults, yet it has a mission, for many will see it in libra- 

 ries and from it learn how to start a campaign against flies. The sooner that the 

 people are interested and educated in insect sanitation, the better for human hfe and 

 health. We should therefore welcome any intelUgent discussion of the subject, though 

 there is no better authority, or one whose advice is safer to foUow, than our own 

 Doctor L. O. Howard. 



W. E. B. 



