352 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 7 



"Difference of management has an important influence on the extent of injury. 

 The degree to which this is true we can see from the fact, for in.stance, that in our 

 clean kept forests under normal weather conditions, etc., the barkbeetles are scarcely 

 a menace; while in North America, where forest management in our sense, to say 

 nothing of a clean forest management, is scarcely known, they are responsible for the 

 gi-eatest devastations in the forests, and in many localities the very existence of the 

 forests is jeopardized bj- them." 



His discussion of "Cultural Methods of Prevention" Professor Borgmann con- 

 cludes thus: 



"If we review the various methods which are founded in the first place on the 

 bases of location and sijlnculture and, in the second, on forest management and forest 

 utilization respectively, it is not difficult to recognize in the composite the fundamental 

 principle of all preventive m3asares that in a well ordered manag? mm', ejmUyjusti- 

 fied hij the principles of a natural sylviculture as well as by economic requiremcnty and 

 free from a cut-and-dried one-sidedness, lies the best foundation for protection against 

 great insect calamities." 



This is what Professor Escherich has to say regarding our Gipsy Moth Campaign: 



"Thus, the gigantic campaign which the Americans are leading against the gipsy 

 moth represents a great step forwards also for German forest entomology; indeed, 

 I may safely say, the most important progress that our science of forest entomology 

 had to record in the last decade. It is therefore quite necessary that tlie German 

 entomologist should be informed about it and that he draw the corresponding knowl- 

 edge from it." 



Like its forebears, this work promises to be a fairly complete compendium of a 



knowledge of forest entomology, especially as apphed to cultivated forests. And 



yet, a careful perusal of the methods of prevention and control as given in the volume 



before us, particularly as to the details of the execution of the latter, thorough and 



comprehensive as they are from the viewpoint of forest conditions and practices in 



western Europe, as regards the United States one is led to the inevitable conclusion 



that not only the principal forest insect depredators but the very forest conditions 



in the United States are so radically different from those prevailing in Europe that, at 



least for the present, the practices prevailing there are applicable here only to a 



limited extent. 



Jacob Kotinsky. 



May 26, 19 U. 



A Textbook of Medical Entomology by W. S. Patton and F. W. 

 Cragg. Christian Literature Society for India, London, Madras 

 and Calcutta, 1913, quarto) pp. i-xxxiv, 1-764, pis. LXXXIX. 



This large volume covers a practically unoccupied field and relates to one of the 

 most important phases of economic entomology. Within its covers we find a com- 

 prehensive and carefully prepared summary of what is known concerning pathogenic 

 insects. The authors have been careful not to draw the lines too closely and still 

 have some regard for space limitations. The book is designed particularly for medi- 

 cal workers in the tropics and is a "guide to a study of the relations between arthro- 

 pods and disease " The information presented is conspicuous by its absence in 

 most text and reference books on economic entomology and was of necessity gathered 

 from numerous and widely scattered sources; in some instances little was available 

 except that published by the earlier students of insect anatomy. The authors have 

 been more concerned in elucidating, and rightly so in this instance, practical points of 

 value to the experimenter and field worker, rather than the improvement of taxonomic 



