410 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 12 



economic changes are making themselves manifest and readjustments 

 accompanied by searching scrutiny are bound to occur. Some of these 

 will have a vital bearing upon the professional man. Adequate com- 

 pensation is as essential in science as in other lines. The recent demon- 

 strations of the power of organized effort have opened new fields of 

 usefulness and increased responsibility accordingly. Have these devel- 

 opments any relation to entomological problems? If such be the case, 

 how can they be utilized? Have the broader phases of entomology 

 received due attention? Can plans be developed which will result in 

 the more comprehensive handling of the numerous problems constantly 

 brought to the attention of the economic entomologist? 



Reviews 



Class Book of Economic Entomology, with Special Reference to the 

 Economic Insects of the Northern United States and Canada, 



by WiLLiAxM LocHHEAD, Philadelphia: P. Blakiston's Son & Co., 

 p*. i-xiv, 1-436, 257 text figures, 1919. Price, $2.50 net. 



The author has condensed in this volume a large amount of information, and deals 

 with the subject in a most comprehensive manner. The first part discusses with the 

 structure, growth and economics of insects, fundamental matter of great importance 

 to the student or individual interested in some phase of insect control. The second 

 and third parts are devoted to insects affecting various crops. Part two, a tabulation 

 designed to facilitate the identification of the pest through its operations, is a most 

 valuable feature. The individual accounts of pests in part three are grouped sys- 

 tematically and only the essentials are given for each species. The identification of 

 the difficult aphids or plant lice is made easier by a brief key to the chief economic 

 genera and a partial list of species having two plant hosts. The author has not 

 hesitated to add other keys where desirable. Part four is limited to a discussion of 

 control methods, insecticides and th6 utilization of parasitic insects. There is also a 

 well chosen bibliography and a glossary. 



The volume, while designed particularly for the classroom, will prove extremely 

 serviceable to many desirous of obtaining a comprehensive idea of insect life. There 

 is an excellent series of illustrations (Advt.). E. P. F. 



NOTICE CONCERNING BACK NUMBERS OF THE JOURNAL 



After January 1, 1920, the price of all back numbers of the Journal of Economic 

 Entomology will be $3.50 per volume, or 75 cents per single number. The supply 

 of Volume 1 is exhausted, but single numbers of this volume that remain on hand 

 can be furnished for 75 cents a copy. Prior to the first of January, 1920, back num- 

 bers can be secured at the present rate of $2.50 per volume or 50 cents per copy. This 

 rate does not apply to copies of Volume 1, which will be sent at the rates quoted above. 



Bank's Index to the Literature of Economic Entomology can be furnished for 

 $5.00 a copy. Fifty cents additional should be added to the price of each volume or 

 copy of Bank's Index, if shipment is to be made to foreign countries. Anyone need- 

 ing back numbers will do well to purchase them before the end of the year. 



A. F. Burgess, Secretary. 



Melrose Highlands, Mass. 



