April, '15] 



REVIEWS 



313 



are of the opinion that the sweetened poison spray should not be considered a 

 failure against the latter pest until it has been tested under different conditions. The 

 best test, we belie\ e, is to choose two isolated orchards, both badly infested the pre- 

 "vious year, and treat them alike in all respects, except that the one shall receive at 

 least three apphcations of sweetened poison (2 or 3 lbs. arsenate of lead to 50 gals, 

 water, sweetened with 1 gal. of cheap molasses), the first application to be made as 

 in Professor O'Kane's experiments, as soon as the earliest flies appear, and the others 

 at intervals of about 10 or 12 days. Both the upper and under surfaces of the leaves 

 should be covered to prevent the mixture being all washed off by heavy or prolonged 

 rains. If these occur the intervals between the apphcations may have to be short- 

 ened or in some cases an extra apphcation given. For best results no unsprayed 

 trees should be left nearer than about 200 yards from the sprayed trees. Cages 

 should be placed ov er the ground under the worst infested trees in both orchards to 

 compare the respective number of flies that emerge in each and thus act to some 

 extent as a check. L. C. 



Insects of Economic Importance, Outlines of Lectures in Eco- 

 nomic Entomology, By Glenn W. Herrick, pp. 1-138, 1915. 



This volume, as indicated by its title, is the outline of lectures given by the author 

 and presents in brief compass the salient facts regarding a large number of the more 

 important insects, together with a discussion of control methods, insecticides and 

 quarantine and insecticide laws. The arrangement is based upon the plant affected, 

 the enemies of all the principal fruit, field and garden crops both north and south 

 receiving due attention. There are also chapters on shade tree insects, the pests of 

 the various domestic animals and those occurring in the house. There is no discus- 

 sion of forest insects, presumably because this matter is taken care of in the College 

 of Forestry. The treatment is practical, necessarily condensed and with each ac- 

 count of an insect there are given several well selected references to additional 

 sources of information. Professional entomologists will find this a very convenient 

 manual; for the practical farmer or fruit grower there are excellent diagnostic ac- 

 <;ounts of the injuries caused by the various pests together with directions for their 

 control, while for the student we know of no better guide to the immediately practi- 

 cal side of apphed or economic entomology. 



