October, ’23] 
REVIEWS 
463 
Reviews 
Manual of Entomology with Special Reference to Economic Entomology, 
by H. Maxwell Lefroy, Professor of Entomology, Imperial College 
of Science and Technology, pp. i-xvi, 1-541, 4 plates and 179 text 
figures. Price, $11.75. New York, Longmans, Green Co.: London, 
Edward Arnold & Co., 1923. 
The author in elaborating a portion of his lecture course on economic entomology 
has given a general account of all groups of insects with special reference to their im¬ 
mature stages, biology and economic importance. He emphasizes identification, a 
prerequisite to efficient control in many cases. His personal acquaintance with the 
faunas of temperate and tropical climates makes possible an unusually comprehensive 
and authoritative volume, the value of which is not lessened by occasional reference 
to American insects. 
The treatment is upon a systematic basis and largely by groups with comparatively 
little attention to individual species. The discussion of the 1500 Scolytidae or Xpidas, 
for example, being limited to less than two pages. The volume is suggestive rather 
than exhaustive and unlike many American works, there are no extensive bibliog¬ 
raphies, the author limiting himself to brief citations of catalogues or monographs, 
thus compelling the student to use such bibliographic aids as Zoological Record, 
Genera Insectorum and the Review of Applied Entomology. 
The book is designed for use with a collection and compels actual acquaintance 
with insects. There are no keys for the identification of species and the relatively 
few illustrations simply give assistance here and there, although the salient characters 
are given for each group. The author recognizes 26 orders, the accounts of the 
Protura and Zoraptera being particularly welcome. 
There are hosts of facts in this rather large, concisely written volume of much 
interest to entomologists throughout the world, and though primarily British, it has 
a much broader scope. E. P. F. 
Insecticides and Fungicides, Spraying and Dusting Equipment, A 
Laboratory Manual with Supplementary Text Material, by O. G. 
Anderson and F. C. Roth, pages i-xvi, 1-349, 70 figures. John 
Wiley & Sons, Inc., New York, Chapman and Hall, Limited, 
London, 1923. 
Part 1 of this volume is a laboratory manual on insecticides, fungicides and 
appliances. It consists of 172 pages devoted to laboratory exercise on insecticides, 
fungicides, combination sprays, miscellaneous materials, such as weed killers, white¬ 
wash and sterilization by steam, fumigants, spraying equipment and cost problems, 
designed to give practical experience in the preparation of materials and a good idea 
of the nature of spraying and dusting apparatus, citations of the more important 
literature being given with each exercise. It is an admirable laboratory manual. 
Part II, pages 173-334, includes comprehensive accounts of methods of controlling 
nsects and plant diseases and extended and very practical discussions of sprayingi 
and dusting equipment, cost of operation and directions for operating a gas engine,— 
literature being freely cited. 
