416 THE CANADIAN ENTOMOLOGIST. 



general way contain the anatomy and the second the biology of insects. 



The first volume will consist of from seven to eight hundred images, and 



will be accompanied by about one thousand figures. Of these, 550 pages 



have been ])ublished in seventeen parts, and the printed parts contain six 



hundred figures and four plates. 



The subjects considered in the first volume, by chapters, are : 



L Brief history of entomology. 



II. Size of insects. 



III. Plan of the insect stiucture. 



IV. Embryology in general. 

 V. Morphology in general. 



VI. Exoskeleton. 

 VII. Endoskeleton. 

 VIII. Muscular system. 



IX. Integument and its structure. 

 X. Glands. 



'inhere still remain to be published chapters on the nervous system 

 and organs of sense, organs of digestion, organs of circulation, organs of 

 respiration, organs of secretion, and sexual organs. In the part already 

 completed the chapters on morphology are marvels of detail and thorough- 

 ness. The work itself is a large octavo, and more than ninety pages are 

 devoted, for example, to the study of the exoskeleton of the head, while 

 nearly eighty pages are occupied with the treatment of the muscular 

 system. Nearly all of the numerous and strikingly apt illustrations are 

 original, having been drawn by Dr. Berlese himself. Each section of the 

 work is followed by a very complete bibliography, and the author has 

 shown a perfect knowledge of the work of other men, the publications of 

 American authors having been considered and studied with a thoroughness 

 quite unusual among European authors. 



The second volume, which has been reserved for the treatment of the 

 biology of insects, v^ill contain a careful consideration of all questions of 

 economic importance, and it w'ill undoubtedly be of interest to learn from 

 •this work Berlese's final views on the subject of ])arasitism, and especially 

 the relations of insects and birds, upon which i)oiot he has long been at 

 odds with other Italian zoologists. L. O. Howart). 



Mailed December 10th, 1906. 



